1Preheat oven to temperature indicated on cake mix package. Prepare two 9 inch round cake pans according to package directions.
2Prepare cake according to package directions, but substitute milk for water, and add 2 teaspoons orange extract. Pour batter into two 9 inch pans and bake as directed. When cakes are cool, slice each layer in half horizontally, making four layers total.
3To Make Frosting: In a large bowl, combine whipped topping, 1/4 teaspoon orange extract, sour cream and confectioners sugar. Mix well to combine.
4Spread frosting between layers, on sides and over top of cake.