Coca-Cola? Brownies

2 cups all-purpose flour
2 cups granulated sugar
1 cup butter or margarine
3 tablespoons cocoa
1 cup Coca-Cola?
1/2 cup buttermilk
2 eggs, beaten
1 teaspoon baking soda
1 1/2 cups miniature marshmallows
1 teaspoon vanilla extract

Preheat oven to 350 degrees F.

Sift together flour and sugar. Heat butter, cocoa and Coca-Cola? to boiling point; pour over sugar mixture.

Mix buttermilk, eggs, baking soda, marshmallows and vanilla extract and add to mixture. Mix well. Batter will be thin. Pour into a greased and floured 13 x 9-inch pan and bake 30 minutes.

Frosting
1 cup margarine
1 cup nuts, chopped
3 tablespoons cocoa
1 teaspoon vanilla extract
6 tablespoons Coca-Cola?
1 (16 ounce) box confectioners? sugar, sifted

Combine margarine, cocoa and Coca-Cola? and heat to boiling. Pour over sugar. Blend with mixer until smooth; add nuts and vanilla extract. Pour over cake while frosting is still hot. Cool and cut into squares.