Buttercream Frosting

Vanilla and Chocolate Buttercream Frosting
2 sticks butter
7 cups powdered sugar, sifted
1/4 cup milk
1 teaspoon vanilla
1/4 cup cocoa powder (I use Valrhona)

1. beat butter until creamy, scrape bowl
2. add 5 cups of sifted powdered sugar, milk, and vanilla, beat until combined
3. add more powdered sugar until you get to the consistency you want (not too stiff so that its hard to pipe)
4. take out half of the buttercream and reserve, this is your vanilla
5. add the cocoa powder to the remaining half and beat to combine, you might need to add a little milk if its too stiff, this is your chocolate buttercream