2 1/4 cups all-purpose flour
1 1/4 cups granulated sugar
3/4 cup unsweetened cocoa powder
1 1/2 teaspoons baking soda
1 teaspoon baking powder
1 teaspoon salt
1 cup milk
1 cup malted milk powder
1 cup vegetable oil
3 large eggs
1 cup sour cream
1 teaspoon vanilla extract
1 cup unsalted butter (room temperature)
1/2 cup unsweetened cocoa powder
3/4 cup heavy whipping cream
1/2 cup malted milk powder
5 cups confectioners' sugar
malted milk balls for garnish
1/2 cup heavy cream
1 cup semi-sweet chocolate chips
1 teaspoon vanilla extract