This delicious homemade blueberry cake filling is thick with a bright, sweet-tart blueberry flavor. It's perfect for filling cakes, pies, cupcakes, tarts, and more! It's easy to make with 3 simple ingredients in under 20 minutes.
Canned blueberry filling simply can't compete with this homemade blueberry cake filling bursting with blueberry flavor! It's made with just frozen blueberries, sugar, and a little lemon juice so the tart blueberries stand out. It's a very versatile filling and delicious in chocolate cupcakes, blueberry shortcake, or blueberry cinnamon rolls!
I used it in my chocolate blueberry cake, and it would also be amazing between the layers of a lemon blueberry cake or on one of my other cake recipes!
Like my strawberry filling, lemon filling, and cherry cake filling, this blueberry filling is more of a compote with chunks of fruit. However, the blueberry juices are cooked down enough so it turns into a thick, jammy filling that is sturdy and won't leak out of your pies and cake layers.
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Why You'll Love This Recipe
- The filling is made with frozen blueberries so you can make it year-round. These are frozen at peak ripeness, so they have the same flavor as freshly picked Summer blueberries.
- You only need 3 ingredients- there's no cornstarch, egg whites or yolks, or other thickeners required.
- The best part about this recipe is that it's easy and only takes 20 minutes to make! You'll never buy blueberry pie filling at the grocery store again!
Ingredient Notes
Here are notes about some of the ingredients used. For quantities and full instructions, see the recipe card below.
- Frozen blueberries- Regular frozen blueberries or frozen wild blueberries work for this recipe. Wild blueberries are smaller with a more concentrated blueberry flavor. Frozen berries release more water than fresh blueberries, which thickens up to create the perfect texture for cake and pie fillings. Plus, frozen berries are cheaper than fresh berries and are available all year!
- Granulated sugar- Regular white sugar enhances the natural sweetness of the blueberries.
- Lemon juice- I love adding a little lemon juice to bring out the tart flavor of the berries. Use fresh lemon juice instead of the bottled stuff for the best flavor!
Substitutions and Variations
- Blueberry substitute: I used frozen strawberries instead to make the filling for this strawberry coconut cake! It also works with frozen raspberries or blackberries.
- Lemon juice substitute: Feel free to use fresh lime or orange juice instead if it complements the flavors of what you're pairing the filling with. You can also add lemon zest to amp up the citrus flavor.
- Flavor extracts: For a sweeter, more subtle flavor than tart, add vanilla extract. You can also experiment with almond or lemon extract.
Step by Step Instructions
Step 1: Add frozen blueberries, sugar, and lemon juice to a medium saucepan over medium-low heat. Cook for 7-10 minutes while gently stirring. The sugar will melt and the blueberries will release their juices.
Step 2: Increase to medium heat and bring the mixture to a simmer. Cook and mix constantly for 10 more minutes so it doesn't burn. Slightly mash some of the berries with your spatula, fork, or potato masher for a smoother texture.
Step 3: Next, increase the heat medium-high and bring to a boil. Right when the blueberry reduction starts boiling, take it off the heat and pour into a heat-proof bowl or jar.
Step 4: Let the filling cool to room temperature and then refrigerate for 1-2 hours or until chilled. It will thicken more as it cools down.
Once the blueberry filling is completely cool, it's ready to use in your baked goods!
Expert Baking Tips
- Cook low and slow. For the filling to gain a jam-like, thick consistency, cook it over low heat for a longer period of time. This lets the blueberries break down and release all their juices.
- Stir often. Remember to stir the blueberry mixture often while it's cooking to keep it from burning and sticking to the bottom of the saucepan.
- Bring to a boil at the very end. This is an important step for getting the right thickness and making sure all the excess liquid is removed.
How to Use
- Use as a cupcake filling for chocolate, lemon, or moist vanilla cupcakes!
- Slather it between layers of chocolate or vanilla cake frosted with blueberry buttercream or classic cream cheese frosting.
- Try as a topping for overnight oats, chocolate mousse pie, yogurt parfaits, or blueberry cheesecake.
- Swirl it into vanilla or graham cracker ice cream or spoon it on top with a dollop of whipped cream.
- Use just the blueberry sauce as a drizzle for lemon pancakes or blueberry cheesecake cookies.
- Roll it up in sweet yeasted dough for cinnamon rolls.
- Use it to fill a blueberry pie (you'll need triple the amount for a 9-inch pie), blueberry danish, or turnovers.
Storage Instructions
Once it's completely cool, store the filling in an airtight container in the refrigerator for up to 4 days.
Freezing
You can freeze cake and pie fillings for up to 3 months in an airtight container.
Before using it, thaw in the refrigerator overnight and then on the counter for a few hours if it's still a little frozen.
Frequently Asked Questions
You can, but you won't need to cook them down as long. They also won't be as juicy since fresh blueberries have less moisture. You might need to add some water!
Yes! You can make the filling and store it in an airtight container in the fridge for up to 4 days or in the freezer for up to 3 months.
Make sure your cake layers are completely cooled and leveled. Pipe a border of frosting around the edge of the first layer to create a dam to prevent the jam from oozing out.
Next, spoon the filling inside the dam, spreading it evenly without overfilling to avoid leaking. Place the next cake layer on top and press down. Repeat the process with additional layers.
After assembling, use an offset spatula to apply a crumb coat on the top and sides of the cake and chill for 15-30 minutes. Once chilled, frost and decorate the outside of the cake as desired. This method is the best way to ensure a perfect cake with no leaky sides!
More Filling Recipes to Try
๐ Recipe
Homemade Blueberry Cake Filling
Equipment
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Ingredients
- 300 grams frozen blueberries
- 100 grams granulated sugar
- 2 teaspoon lemon juice
Instructions
- Add frozen blueberries, sugar, and lemon juice to a saucepan over medium-low heat. Cook for 7-10 minutes while gently stirring until the sugar melts and the blueberries release their juices.300 grams frozen blueberries, 100 grams granulated sugar, 2 teaspoon lemon juice
- Bring the mixture to a simmer and mix constantly for 10 more minutes. Mash the softened berries with your spatula or a fork.
- Bring to a boil. Once the filling starts boiling, immediately take it off the heat and pour into a heat-proof bowl or jar.
- Cool to room temperature, then chill in the refrigerator for 1-2 hours before using in your baked goods.
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