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    Home » Recipes » Cake and Pie Recipes

    Rhubarb Crumb Cake

    Published: May 10, 2023 by Megan Weimer · This post may contain affiliate links.

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    Jump to Recipe Jump to Video Print Recipe

    This rhubarb crumb cake has a soft and moist vanilla cake base topped with a layer of tart fresh rhubarb. A sweet, buttery streusel topping is sprinkled on top, adding a delicious crunch to each bite.

    If you love crumb cakes or fruity cakes in general, make these recipes next- strawberry crumb cake, strawberry vanilla cake, and lemon berry mascarpone cake.

    Square cake pieces stacked on each other.

    It's Spring, and you know what that means- rhubarb season is here! A rhubarb crumb cake is the perfect way to incorporate it into your Spring bakes.

    So what is this weird pink celery looking thing anyways? Rhubarb is actually a vegetable that is often used like a fruit in sweet dishes, like pies, cakes, and jams because of its sour flavor. It has long, thick, pinkish-red stalks and large green leaves. It's a popular ingredient in desserts but can also be used in savory dishes like sauces and marinades.

    Rhubarb is a truly seasonal crop, typically available in the Spring and early Summer months. Raw rhubarb is incredibly sour, almost as tart as a lemon. That's why it's usually cooked with lots of sugar to make it palatable.

    A close up of a square piece of cake.

    Rhubarb is the perfect addition to crumb cake. This isn't like your typical New York style crumb cake or coffee cake; the vanilla sponge is much more soft, delicate, and moist with a tight crumb. Rhubarb is layered on top of that and sprinkled with a sweet, buttery crumble. The result is Spring in a bite!

    Serve this crumb cake at brunch, a Summer BBQ, or with a scoop of vanilla ice cream for an indulgent dessert. You're going to absolutely love it!

    Jump to:
    • Ingredient Notes
    • Substitutions
    • Helpful Equipment and Tools
    • Step by Step Instructions
    • Expert Baking Tips
    • Additions and Variations
    • Storage and Freezing
    • Frequently Asked Questions
    • More Cake Recipes to Try
    • 📖 Recipe
    • 💬 Comments

    Ingredient Notes

    Here are some notes about the ingredients used. For quantities and full instructions, see the recipe card below.

    Ingredients to make rhubarb cake.
    Ingredients to make a crumble.
    • All purpose flour- Using all purpose flour instead of cake flour makes the crumb cake a bit more moist and hearty.
    • Granulated sugar- White sugar sweetens the batter and helps the cake retain moisture. It's also used to sweeten the crumble.
    • Brown sugar- This adds moisture and sweetness to the crumble. You can use light or dark brown sugar.
    • Unsalted butter- Unsalted butter is in the cake and crumble for flavor, richness, and to control the amount of salt in the batter. For the cake, make sure it's at room temperature so it creams in easily. It should be cool to the touch and easy to indent with your finger. Melted butter is best for the crumble since it lends a crisp texture.
    • Baking powder- This leavener helps the cake rise by adding air bubbles. Make sure it isn't expired and don't substitute baking soda since it's much stronger.
    • Salt- You need a little salt so the cake isn't too sweet and bland.
    • Eggs- Two large eggs add moisture, richness, and bind everything together. Make sure they're room temperature so they mix in nicely.
    • Vanilla extract- Vanilla enhances all the ingredients and rounds out the flavor profile.
    • Buttermilk- If you've made my cakes and muffins before, you know I love buttermilk. It adds a slight tang while tenderizing the gluten for a super soft cake!
    • Rhubarb- The star of our recipe! You'll need 3 stalks of rhubarb chopped into 1 inch pieces.
    • Orange zest- This is mixed with the rhubarb to add a little citrusy sweetness to mellow the tartness. Any kind of orange works, from navel to Mandarin.

    Substitutions

    • All purpose flour: To make a gluten free crumb cake, substitute Bob's Red Mill 1-to-1 Gluten Free Baking Flour .
    • Unsalted butter: Don't worry if you only have salted butter! Just omit the extra salt.
    • Buttermilk: Substitute plain kefir, plain Greek yogurt, or sour cream at a 1:1 ratio. Additionally, you can make your own buttermilk by mixing ½ cup milk with 1 ½ teaspoons vinegar or lemon juice. Let the mixture curdle 10 minutes and it's ready to use.
    • Rhubarb: Not a rhubarb fan? No problem! You can make this cake with a variety of fresh fruit, like strawberries, chopped apples, blueberries, or blackberries.

    Helpful Equipment and Tools

    • A 9x9" square baking pan is needed to bake the cake in. Use a metal pan, not glass or silicone. Glass doesn't heat evenly and silicone can cause your cake to burn. If your pan isn't non-stick, don't forget to spray it with baking spray before lining with parchment paper.
    • To mix the cake batter, you need an electric hand mixer. You can also make it with a stand mixer fitted with the paddle attachment.

    Step by Step Instructions

    Here's how to make a rhubarb crumble cake! Before you start, wash, dry, and chop your rhubarb stalks. Preheat the oven to 350°F/180°C, line your square pan with parchment paper, and set it aside.

    A crumble in a white bowl.

    STEP 1: First, make the crumble by whisking melted butter, sugar, brown sugar, and flour together in a small bowl until clumpy. Set in the the fridge until you're ready to use it.

    Dry ingredient for cake being whisked in a bowl.

    STEP 2: Stir together the all purpose flour, sugar, baking powder, and salt in a large mixing bowl with a whisk.

    Flour and butter in a bowl.

    STEP 3: Add the softened butter to the dry ingredients. Beat on low with a hand mixer for 5 minutes or until the texture is sandy. This is called the reverse creaming method.

    Cake batter in a bowl.

    STEP 4: With the mixer running on low, add the eggs and vanilla. 

    Cake batter in a glass bowl.

    STEP 5: Stream in the buttermilk next. Continue to mix on medium speed until the batter is combined with no puddles of liquid.

    Cake batter spread in a square baking pan.

    STEP 6: Pour the batter into your prepared baking pan. Spread it evenly across the pan with an offset spatula or the back of a spoon. Set aside.

    Chopped rhubarb and orange zest in a white bowl.

    STEP 7: Next, toss the chopped rhubarb and orange zest together in a medium mixing bowl.

    Chopped rhubarb in a pan on top of cake batter.

    STEP 8: Evenly sprinkle the rhubarb over the cake batter. Don't press the rhubarb in, just make sure it lays evenly on top of the batter.

    Cake batter covered with crumble in a square pan.

    STEP 9: Next, take the crumble out of the refrigerator and sprinkle it all over the top of the rhubarb. Bake the cake for 40-50 minutes or until a toothpick inserted in the center comes out clean with a few moist crumbs.

    A close up of a crumb cake slice.

    STEP 10: Let the cake cool for 20 minutes, then pull the parchment up, lifting the cake out of the pan onto a wire cooling rack. Let it cool on the rack for 30 minutes or until it reaches room temperature. Dust with powdered sugar, slice, and enjoy!

    Expert Baking Tips

    • Don't eat the leaves. Your fresh rhubarb might have leaves on it, but make sure to cut them off because they're actually poisonous!!
    • Use a kitchen scale. For accuracy and consistent results, measure the flour in grams with a food scale instead of using cup measurements. If you don't have a scale, fluff the flour up first before spooning it into your measuring cup.
    • Chill the crumb topping. Let the crumb topping chill in the fridge for at least 10 minutes before sprinkling it on the cake. This prevents it from melting into the cake and helps it hold its shape.
    • Don't skimp on the crumble! The crumb topping is buttery and sweet, which contrasts the sourness of the rhubarb. Be generous with it!

    Additions and Variations

    Here are some extra ingredients you can add to the cake! Note that I haven't tried any of these myself, so let me know how it turns out below.

    • Nuts: Chopped almonds, pecans, or walnuts add a delicious crunch to the topping or to the cake batter itself.
    • Spices: Adding spices like cinnamon, nutmeg, or ginger to the cake batter or crumble topping can give your rhubarb crumb cake an extra kick of flavor.
    • Lemon zest: A little bit of lemon zest adds a bright, fresh flavor to the tangy rhubarb and rich streusel. You can add this or substitute it for the orange zest.
    Rhubarb crumb cake pieces stacked on each other with glass of milk in the background.

    Storage and Freezing

    Leftover crumb cake stays fresh for 2-3 days at room temperature. Just wrap it up in plastic or store in an airtight container. Don't put it in the fridge because it can make the cake dry and the crumb topping mushy.

    Freezing

    Freeze cut slices in a sealed, freezer-safe container for up to 1 month. When you're ready for a slice, let it thaw on the counter for a few hours or in the fridge overnight.

    Frequently Asked Questions

    Where can I buy rhubarb?

    You can find rhubarb at farmer's markets, co-ops, and some larger grocery stores like Whole Foods when it's in season. Rhubarb season starts in late March and lasts through July.

    Can I use a different sized pan?

    You sure can! You can use an 8x8" pan or 9x13" baking dish. It'll be really thin in a 9x13" pan, so I recommend doubling the recipe if you're planning on using one.

    Is crumb cake the same as coffee cake?

    Both cakes are slightly different. Coffee cake typically has 2 layers of streusel, one running through the center and one on top. Crumb cakes only have a crumble layer on top.

    More Cake Recipes to Try

    • Raspberry brownie cheesecake on a marble platter.
      Raspberry Brownie Cheesecake
    • A chocolate cake on a marble platter with chocolate covered Rice Krispies on top.
      Chocolate Crunch Cake
    • A chocolate cake on a wood cake stand.
      Chocolate Cake with Cream Cheese Frosting
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      Chocolate Ganache Cake

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    📖 Recipe

    Slices of rhubarb crumb cake on top of each other.

    Rhubarb Crumb Cake

    Megan Weimer
    This rhubarb crumb cake has a soft and moist vanilla cake base topped with a layer of tart fresh rhubarb. A sweet, buttery streusel topping is sprinkled on top, adding a delicious crunch to each bite.
    5 from 1 vote
    Print Recipe Pin Recipe
    Prep Time 15 minutes mins
    Cook Time 45 minutes mins
    Total Time 1 hour hr
    Course Dessert
    Cuisine American
    Servings 16 slices
    Calories 240 kcal

    Equipment

    • 1 9x9" square baking pan

    Ingredients
     
     

    Crumble Topping

    • ¼ cup unsalted butter melted
    • ¼ cup granulated sugar
    • ¼ cup brown sugar light or dark, packed
    • ½ cup all purpose flour

    Cake

    • 1 ½ cup all purpose flour
    • 1 cup granulated sugar
    • 1 teaspoon baking powder
    • ¼ teaspoon salt
    • ⅔ cup unsalted butter softened
    • 2 large eggs room temperature
    • 2 teaspoon vanilla extract
    • ½ cup buttermilk room temperature

    Rhubarb Topping

    • 3 stalks rhubarb chopped
    • 2 tablespoon orange zest

    Instructions
     

    • Chop your rhubarb and set aside. Preheat the oven to 350°F/180°C and lightly grease a 9x9" square baking pan and line with parchment paper. Set aside.

    For the Crumb

    • Mix the melted butter, granulated sugar, brown sugar, and flour together in a small bowl with a spoon until crumbles form. Place in the fridge to chill.
      ¼ cup unsalted butter, ¼ cup granulated sugar, ¼ cup brown sugar, ½ cup all purpose flour

    For the Cake

    • Whisk the flour, sugar, baking powder, and salt together in a large mixing bowl until combined.
      1 ½ cup all purpose flour, 1 cup granulated sugar, 1 teaspoon baking powder, ¼ teaspoon salt
    • Add the softened butter and beat on low with a hand mixer or stand mixer until it looks like wet sand.
      ⅔ cup unsalted butter
    • Mix in the eggs and vanilla with the mixer on low.
      2 large eggs, 2 teaspoon vanilla extract
    • Stream in the buttermilk as the mixer runs on low. Turn the speed up to medium and mix until smooth and well combined.
      ½ cup buttermilk
    • Pour the cake batter into the prepared pan. Spread it evenly with an offset spatula or butter knife.
    • Toss the chopped rhubarb and orange zest together in a medium bowl.
      3 stalks rhubarb, 2 tablespoon orange zest
    • Sprinkle the rhubarb on top of the cake batter, not pressing it in.
    • Generously sprinkle the crumble on top.
    • Bake for 40-50 minutes until a toothpick inserted in the center comes out clean.
    • Let the cake cool in the pan for 20 minutes, then pull on the parchment paper to lift the cake out of the pan. Place it on a wire cooling rack and let it come to room temperature. Dust with powdered sugar, slice, and enjoy!

    Video

    Notes

    Weigh the flour in grams with a food scale for best results. If you don't have one, fluff the flour up in the bag before scooping it into your measuring cup. Swipe off the excess.
    Nutritional information is an estimate and not guaranteed to be accurate.
    Storage: Store at room temperature for 2-3 days in an airtight container.
    Freezing: Freeze leftovers in an airtight, freezer-safe container for up to 3 months. Let a slice thaw on the counter for a few hours or in the refrigerator overnight when you're ready to enjoy.

    Nutrition

    Serving: 1sliceCalories: 240kcalCarbohydrates: 32gProtein: 2.8gFat: 11.5gSaturated Fat: 7gPolyunsaturated Fat: 0.6gMonounsaturated Fat: 3gTrans Fat: 0.4gCholesterol: 49.2mgSodium: 81.8mgPotassium: 72.4mgFiber: 0.7gSugar: 19.5gVitamin A: 380IUVitamin C: 1.8mgCalcium: 44.4mgIron: 0.9mg
    Keyword crumb cake, rhubarb
    Tried this recipe?Let us know how it was!

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    About Megan Weimer

    Megan Weimer is the recipe developer, writer, and food photographer behind Dollop of Dough. Since 2020, she's been inspiring home bakers to create low-key, yet elevated desserts that range from traditional to allergy-friendly.

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    Hi there, I'm Megan!

    Welcome to Dollop of Dough! I'm a self-taught baker and professional recipe developer sharing traditional and allergy-friendly dessert and drink recipes that are easy to prepare for everyday occasions. With each recipe, I hope to spark joy and inspire my community of dessert enthusiasts.

    Read more about Megan here!

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