Fast As Lightning Mississippi Mud Cake

Total Time
Prep 15 mins
Cook 35 mins

A really quick recipe that gives good results! Adapted from Southern Living magazine.

Ingredients Nutrition

  • 236.59 ml chopped pecans
  • 2 (999.32 g) package fudge brownie mix
  • 2 large eggs (or as directed on pkg.)
  • 118.29 ml vegetable oil (or as directed on pkg.)
  • 59.14 ml water (or as directed on pkg.)
  • 297.66 g bag miniature marshmallows
  • chocolate frosting (store bought or homemade)


  1. Place the pecans in a single layer on a baking sheet.
  2. Bake at 350° for 8-10 minutes or until toasted.
  3. Prepare mix according to the package directions using eggs, vegetable oil, and water; pour into a greased 15x10 x 1-inch jelly-roll pan.
  4. Bake at 350° for 25 minutes. Remove from oven, and top with marshmallows; bake 8 to 10 more minutes.
  5. Drizzle warm cake with Chocolate Frosting, and sprinkle evenly with toasted pecans. Enjoy!
Most Helpful

Dh LOVES Mississippi Mud Cookies, so he requested a cake like that for his b-day. I didn't have much time to do the more involved recipes I found, but this one seemed like a good sub. He wasn't crazy about the marshmallow topping, but the rest of us loved it. I only used one box of brownies and put it in a 9x13 pan. I also melted the frosting in the microwave for a minute or so, to make it easier to drizzle. The boys and I snacked on it all weekend, so it was definitely a keeper for us. :-)

Luv2Cook/Hate2Clean:) December 19, 2011

We really enjoyed this cake. It was so easy to make. Loved the toasted pecans too. Will make again soon. Thanks for posting.

gwynn May 26, 2010

We all LOVED this easy and delicious treat. I halved the recipe because *each* box of brownie mix needed 2-3 eggs and 2/3 cup oil and I didn't have enough oil. I let the marshmallows deflate and cool a little before drizzling with Grandma's Chocolate Fudge Frosting. I used walnuts instead of pecans but otherwise followed the recipe. Thanks for posting this delicious treat!

Karen=^..^= January 01, 2008