Chocolate Cake with Chocolate Sour Cream Frosting

My new favorite cake!

Chocolate Cake with Chocolate Sour Cream Frosting

Cake:
3/4 cup butter, softened
3 eggs
2 cups flour (or 1.5 cups rice flour, .5 cup potato starch, 1 tsp xanthan gum)
3/4 cup unsweetened cocoa powder
1 teaspoon baking soda
3/4 teaspoon baking powder
1.5 cups sugar
2 teaspoons vanilla
1.5 cups milk

Combine flour, cocoa, baking powder and baking soda ingredients in bowl. S et aside. In mixer, beat butter until smooth. Add sugar until well mixed. Add eggs, beating after each addition. Alternately beat in dry mixture and milk until smooth. Prepare one 13 x 9 x 2 pan or 2 9-inch round pans. Pour batter into prepared pan(s) and spread evenly. Bake at 350 for 40 minutes for rectangular pan or 35 minutes for round pans.

Frosting:
(halve for sheet cake)
1 12-oz package of semisweet chocolate chips
1/2 cup butter
1 8-oz carton sour cream
4 cups powdered sugar

In saucepan over low heat melt butter and chocolate. Remove from heat and allow to cool slightly. Stir in sour cream until smooth. Gradually add powdered sugar, mixing well, until desired consistency is reached.