Things You'll Need:
- For cake:
- Large heat-resistant bowl
- 2 cups all-purpose flour
- 1 tsp. baking soda
- 2 cups sugar
- 1 1/2 cups miniature marshmallows
- 1/2 cup unsalted butter
- 1/2 cup vegetable oil
- 1 cup Coca-Cola
- 6 tbsp. cocoa powder
- 2 large eggs
- 1/2 cup buttermilk
- 1 tsp. vanilla extract
- For frosting:
- Medium heat-resistant bowl
- 1/2 cup unsalted butter
- 3 tbsp. cocoa powder
- 6 tbsp. Coca-Cola
- 1 lb. powdered sugar
- 1 tsp. vanilla extract
- 1 cup chopped pecans (optional)
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Step 1
Place an oven rack in the center position and preheat the oven to 350 degrees Fahrenheit.
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Step 2
Grease a 9-by-13-inch cake pan with either nonstick spray, or a layer of shortening and a dusting of flour.
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Step 3
Whisk your flour, baking soda and sugar together in a large heart-resistant bowl. Stir in your marshmallows.
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Step 4
Melt your butter in a small pot. Stir in your vegetable oil and Coca-Cola. Gently whisk in your cocoa powder and bring the mixture to just a boil.
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Step 5
While the mixture comes to a boil, whisk your eggs, buttermilk and vanilla extract together in a small bowl.
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Step 6
Stir the hot cola mixture carefully into the flour mixture until it's completely incorporated. Then stir in your buttermilk mixture, mixing well.
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Step 7
Pour the batter into your cake pan and bake for 30 minutes.
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Step 8
Make the frosting while the cake is baking. Put the butter, cocoa powder and Coca-Cola for the frosting into a small pot, and bring the mixture to a boil.
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Step 9
Stir the hot mixture carefully into the powdered sugar until it's completely combined. Stir in the vanilla extract, then mix in the nuts. Set the frosting aside until the cake is done.
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Step 10
Check to see whether the cake is done after 30 minutes. It will bounce back when gently pressed, and a tester should come out dry, though some cooked cake crumbs may stick to it. If the cake isn't completely baked through, bake it further and keep checking until it's done.
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Step 11
Pull the finished cake out of the oven and, while it's still hot, immediately pour the hot frosting over the top of it.
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Step 12
Allow the cake to cool completely before serving.














