Kim, I hope this is what you're looking for.

Coca-Cola Chocolate Cake

2 c. unsifted cake flour
2 c. sugar
2 sticks butter
2 tbsp. cocoa
1 c. Coca-Cola
1/2 c. buttermilk
1 tsp. baking soda
2 eggs
1 tsp. vanilla
1/4 tsp. salt

Sift together the flour and sugar. Heat to boiling point the butter, cocoa and Coca-Cola. Add to the flour and sugar mixture. Stir to blend. Add buttermilk, soda, eggs, salt and vanilla. Stir with a spoon until well blended.

Pour into a greased and floured oblong pan (Pyrex dish). Bake at 350 degrees for 30-35 minutes. Batter will be thin. Ice while hot.

Coca-cola Icing:
1/2 c. butter
6 tbsp. Coca-Cola
1 box confectioners' sugar
1 tsp. vanilla
2 tbsp. cocoa

Heat to boiling point the butter, cocoa and Cola-Cola. Add confectioners' sugar and vanilla; stir to blend. Using a fork, make holes in the hot cake and pour the hot icing over it.