Homemade Hostess Cupcake Cake

Bahan-bahan (18 porsi)

• 1 stick (1/2 cup) salted butter, melted
• 2 large eggs, at room temperature
• 1/2 cup buttermilk, at room temperature
• 1/2 cup plain Greek yogurt or sour cream
• 1 cup granulated sugar
• 1 tablespoon vanilla extract
• 1 1/2 cups all-purpose flour
• 1 cup unsweetened cocoa powder
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1 teaspoon salt
• 3/4 cup hot black coffee
• 1/2 cup dark or semi sweet chocolate chips ((optional))
• 1 stick (1/2 cup) salted butter at room temperature
• 1/2 cup packed dark brown sugar
• 1 teaspoon salt
• 1 bag (10-ounce) mini marshmallows
• 1 cup semi-sweet chocolate chips
• 1/3 cup milk
• 1 cup white chocolate chips, melted