This blue velvet cake has an angel food base with fresh blueberries baked into the cake, and is coated in a delicious and creamy cream cheese frosting.
Preheat the oven to 375 degrees Fahrenheit. In a medium-sized bowl, sift together the flour, 1/2 cup of the sugar, and the cocoa powder.
In a large bowl, beat together the egg whites, vanilla extract, cream of tartar and salt until they begin to hold soft peaks. Then beat in the remaining 3/4 cups sugar and the blue food coloring until the mixture begins to hold stiff peaks, about 4 minutes or so.
Slowly fold in 1/4 cup of the flour mixture at a time. Use a spatula and take care not to stir the mixture, just keep folding until all of the flour mixture is incorporated. Pour one cup of blueberries into the batter and fold them in as well. Pour the batter into two well-greased 9-inch cake pans and bake in the oven for about 20-30 minutes.
Once the cake layers and the frosting have finished cooling, place the bottom cake layer onto the display surface, (i.e. a cake stand or pretty plate that you will serve it off of), and begin evenly frosting the top of the bottom cake layer.
Then, center the second cake layer on top of the bottom cake layer so that they line up perfectly. Now frost the sides and top of the cake so that the entire cake surface is frosted and no cake surface is visible through the frosting. Take the remaining 1/2 cup of blueberries and arrange them on top of the cake. Serve immediately.