How to make Marbleized Cupcakes

I couldn't make up my mind, but in this case that isn't a bad thing! I made these marbleized chocolate vanilla cupcakes and topped them with a two-tone buttercream then smothered them in a dark chocolate ganache. I'm going to warn you these will be messy to eat but beyond worth it!
Ingredients:
For the Cupcakes:
1 2/3 cups all purpose flour
1 cup sugar
1/4 tsp baking soda
1 tsp baking powder
3/4 cup salted butter (170g)
3 egg whites
3 tsp vanilla extract
1/2 cup sour cream
1/2 cup milk
Reserve 1.5 cups of the batter an mix with 1/4 cup of cocoa powder
For the Italian Buttercream:
3 large egg whites
1 cups sugar
Pinch kosher salt
12 ounces unsalted butter, room temperature cut into 1-inch pieces
1/2 teaspoon pure vanilla extract
For the Ganache:
1/2 cup semisweet chocolate
1/2 cup cream

Category : Cuisine & pâtisserie

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