Easy Mississippi Mud Sheet Cake

Total Time
Prep 15 mins
Cook 22 mins

This is an easy one-bowl cake that is nothing short of amazing! --- make certain to prepare the frosting glaze while the cake is baking as it must be added on while the cake is still warm, no baking powder or soda in this cake, it's a rich dense chocolate cake that more like a brownie texture.

Ingredients Nutrition


  1. Set oven to 350 degrees F.
  2. Grease a 15 x 10-inch jelly-roll pan.
  3. For the cake; in a large bowl beat the melted butter with the next 5 ingredients until combined and smooth.
  4. Add in flour; mix until blended.
  5. Pour the batter into prepared baking pan.
  6. Sprinkle the nuts over the top then push down slightly into the batter.
  7. Bake for about 20 to 22 minutes or until the cake tests done.
  8. At this point prepare the chocolate frosting while the cake is baking (the cake must be warm before adding on).
  9. For the frosting; in a medium bowl beat all ingredients together until smooth and blended; set aside to pour over warm cake.
  10. Remove from oven then sprinkle the mashmallows on top; return to oven for another 5 minutes.
  11. Drizzle the prepared chocolate frosting over top of the marshmallows.
Most Helpful

Eating this cake was a first for me, and am now sure that I will make it again and again. I liked it better the second day and as the cake aged, I thought that it steadily improved. The only two changes I made was to add a grated chocolate bar which had nuts in it, instead of the walnuts called for in the recipe; and added chocolate chips along with the chocolate bar. This cake is delicious and it's hard to refuse just one more piece.

Potluck Genie... June 26, 2010

This has always been one of my favorite cakes so I decided to treat myself and DH and make this for Kitten in honor of her husband, John. It is so rich and dense and just absolutely yummy!

Luby Luby Luby December 06, 2008

This cake has been around a while. It is soooo delicious, rich and yummy. Thanks for bringing it back to memory. Will make it soon. Thanks for posting.

gwynn November 12, 2008