Cake:
1 C. Flour
1 C. Sugar
1/2 t. Baking Soda
1/2 C. Margarine
1/2 C. Carbonated Cola Beverage
1/4 C. Miniature marshmallows
2 T. Unsweetened Cocoa
1/4 C. Buttermilk
1 Egg, beaten
Chocolate-Cola Icing:
1/4 C. Margarine
2 T. Unsweetened Coca
2 T. Cola
1 1.2 C. Powdered Sugar
1/2 C. Chopped Walnuts (optional)

Cake:

In a large bowl, mix flour, sugar, and soda; set aside. In a saucepan over low heat, stir in margarine, cola and marshmallows until blended (and marshmallows melt). With a whisk or fork, stir into flour mixture. Stir in buttermilk and egg until blended. Turn into greased 8x8x2 pan. Bake in 350 oven for 30 minutes or until toothpick inserted into the center comes out clean. Cool in a pan on rack. Frost with cola icing. Cut into squares to serve.

Icing:

In saucepan over low heat, stir in margarine, cola, cocoa until melted. Remove from heat. With a whisk or fork, beat in sugar until smooth. Stir in pecans (optional).