Combine flour, sugar, cocoa, soda and salt. In a saucepan, bring the butter and Cola to a boil and then add to the dry ingredients and mix with a mixer until well incorporated. Add buttermilk, eggs, vanilla and marshmallows and continue mixing until thoroughly mixed together. This will be a very thin batter with the marshmallows floating on top. Bake in a 9 x 13 inch baking pan that has been sprayed with cooking spray in a preheated 350° oven for 45 -60 minutes until a toothpick or cake tester comes out clean when inserted in the middle of the cake.
For a delicious coca cola and marshmallows recipe, watch this video by LynnsRecipes and get ready to surprise your guest the next time you have a party at home. This delicious cake is sure to please everyone's taste buds!