Source: https://thesouthernladycooks.com/southern-coca-cola-cake/
Serves 10
1. Combine sugar, flour, and cinnamon in a large bowl and mix well using a whisk.
2. Combine butter, 1 cup Coca Cola, and cocoa in a pot and bring to a boil, stirring often.
3. Remove from heat and pour over flour mixture. Mix with a spoon.
4. Mix buttermilk and baking soda together and pour into cake mixture. Add marshmallows and continue stirring (they will not melt). Add in eggs and vanilla extract.
5. Pour into a sprayed 9 x 13 inch pan. Bake at 350 degrees for 30 to 35 minutes. Prepare frosting while the cake is baking.
6. For the frosting, bring margarine, cocoa and 6 tablespoons Coca Cola to a boil on the stove.
7. Remove from heat and add vanilla extract and powdered sugar until frosting is of spreading consistency. Spread over hot cake, and sprinkle pecans on top.