Preheat the oven to 350 degrees Fahrenheit (180 degrees Celsius) and line a 8X8 or 9X9-inch square baking pan with parchment paper. Set aside.
Melt the chocolate in a heatproof bowl in the microwave, mixing every 15 seconds until completely smooth and melted. Whisk in the oil and let cool slightly.
180 grams chopped chocolate, 108 grams oil
In a large mixing bowl, beat the granulated sugar, brown sugar, eggs, egg white, and vanilla extract together on medium-high speed for 2-4 minutes or until pale.
200 grams granulated sugar, 55 grams brown sugar, 3 large eggs, 1 egg white, 2 teaspoon vanilla extract
While beating, stream in the melted chocolate and oil. Continue mixing until well combined.
Fold the all purpose flour, cocoa powder, and salt into the wet ingredients with a rubber spatula until the dry streaks disappear.
94 grams all purpose flour, 43 grams cocoa powder, ½ teaspoon salt
Pour the brownie batter into the prepared baking pan and smooth out the top. Bake for 26-32 minutes or until a toothpick inserted in the center comes out with moist crumbs but no wet batter.
Take the brownies out of the oven and let them cool completely in the pan before frosting.
Cream Cheese Frosting
Beat the softened butter and cream cheese together in a large bowl with on medium-high speed until smooth and fluffy.
56 grams unsalted butter, 113 grams full fat cream cheese
Gradually beat in the powdered sugar one cup at a time on low until well combined.
240 grams powdered sugar
Add the vanilla extract and salt and mix on low until well combined. Increase the speed to medium, mixing until light and fluffy.
½ teaspoon vanilla extract, ⅛ teaspoon salt
Spread the frosting evenly across the pan of cooled brownies, slice, and enjoy!
Notes
Use room temperature eggs, butter, and cream cheese so everything is easy to mix.Use full fat softened cream cheese for the frosting. Low-fat cream cheese is too runny.The brownies are done when a toothpick or skewer inserted in the center comes out with moist crumbs but no wet batter.Storage: Store frosted brownies in an airtight container in the refrigerator for up to 5 days. Let warm on the counter for about 20 minutes before eating. Store unfrosted brownies at room temperature in an airtight container for 3-4 days.Freezing: Slice the brownies into squares and wrap each piece in plastic wrap before placing in a freezer bag. Freeze for up to 3 months. When you're ready to eat, let thaw on the counter for an hour or microwave for up to 30 seconds.