Ingredients
1/2 cup butter, softened2-1/4 cups packed brown sugar3 large eggs3 ounces unsweetened chocolate, melted and cooled1-1/2 teaspoons vanilla extract2-1/4 cups all-purpose flour2 teaspoons baking soda1/2 teaspoon salt1 cup sour cream1 cup boiling waterFROSTING:1/2 cup butter, softened4 cups confectioners’ sugar1 teaspoon vanilla extract4 to 6 tablespoons milk14 to 16 each each plain blue, yellow, black or brown, green and red M&M’s
Preparation
In a bowl, cream the butter and brown sugar. Add eggs, one at a time beating well after each addition. Beat in the chocolate and vanilla. Combine the flour, baking soda and salt; add to the creamed mixture alternately with sour cream. Whisk in water until smooth. Pour into a greased 13x9-in. baking pan. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes; invert onto a wire rack to cool completely.
For frosting, combine butter, confectioners’ sugar, vanilla and enough milk to achieve spreading consistency. Frost sides and top of cake. With a glass (about 2-1/4-in. diameter), outline five interlocking circles on frosting. Use M&M’s in order listed to cover each circle with a single color.
