How to Make a holiday tree out of delicious frosted cupcakes

It's both a dessert and a centerpiece! For this recipe, you will need: 1 1/2 sticks unsalted butter, 1 1/2 cups sugar, 6 egg yolks, 6 eggw hites, 1/4 cup sugar, 1 teaspoon vanilla, 3 cups cake flour, 1 teaspoon salt, 3/4 teaspoon baking powder, 3/4 teaspoon baking soda, 1 cup sour cream, 2 1/2 sticks unsalted butter, 4-5 cups powdered sugar, 1 teaspoon vanilla extract and food coloring.