1 c. butter, softened
2 c. all-purpose flour
1 3/4 c. sugar
3 tbsp. cocoa
1 tsp. baking soda
1 tsp. vanilla
2 eggs
1/2 c. buttermilk
1 c. Coca-Cola
1 1/2 c. miniature marshmallows

Combine all ingredients except marshmallows in large mixing bowl; blend at low speed in mixer. Blend well, then add marshmallows by hand. Pour batter in to greased 13x9 inch pan; bake at 350 degrees for 35 minutes or until toothpick comes out clean; cool 15 minutes and then spread icing.

COCA-COLA ICING:

Combine 1/2 cup butter, 3 tablespoons cocoa, 1/3 cup Coca-Cola and 1 box confectioners sugar; beat until smooth, then stir in 1 cup chopped pecans and spread on cake.