MISSISSIPPI MUD BROWNIES
My favorite one-bowl brownie recipe topped with warm gooey marshmallows and chocolate frosting. 
First, I just love brownies. I have tons of different brownie recipes on my site too. I’m thinking of sharing my favorite “brownie in a mug” recipe soon. Anyone interested? It’s our go-to treat when my husband and I want something sweet, fast, that doesn’t make a mess.
Brownies are the best. Top them with marshmallows and the best creamy homemade chocolate frosting and I’m pretty much in heaven.
Second, my Mississippi Mud Cake recipe totally went viral on facebook–it’s had over 9 MILLION views. Say whhhaa?! Obviously you all love the chocolate/marshmallow combo as much as I do, so it’s high time I shared these insanely delicious Mississippi Mud Brownies!
These little beauties are really simple. They start with a super easy, one-bowl brownie recipe. That’s right–mix all the ingredients in just one bowl.
My favorite one-bowl brownie recipe topped with warm gooey marshmallows and chocolate frosting. 

Ingredients
For the brownies:
  • 1/3 cup unsweetened cocoa powder
  • 1/2 cup oil (canola or vegetable)
  • 1/2 cup butter , softened
  • 2 cups granulated sugar
  • 4 large eggs
  • 2 teaspoons vanilla
  • 1 1/2 cups flour
  • 1 teaspoon salt
  • 3 cups mini marshmallows
For the frosting:
  • 1/2 cup melted butter
  • 1/3 cup unsweetened cocoa powder
  • 1/3 cup evaporated milk
  • 1 teaspoon vanilla
  • 3 - 3 1/2 cups powdered sugar

Instructions
  1. Preheat oven to 350 degrees F. Grease a 9x13'' pan with non-stick cooking spray.
  2. In a large mixing bowl, pour oil over cocoa powder and mix. Add softened butter and mix until smooth. Add sugar and mix for 1 minute. 
  3. Add eggs, one at a time, mixing after each addition. Add vanilla and mix. Add flour and salt and stir to combine. 
  4. Pour batter into prepared pan. Bake for 25-30 minutes or until a toothpick inserted into the center comes out clean.
  5. Remove brownies from the oven and sprinkle the marshmallows evenly on top. Return to the oven for 2-3 minutes or until the marshmallows are puffed. Remove from oven and allow them to cool completely.
  6. Once brownies are cool, make the frosting.
  7. For the frosting:
  8. Add melted butter, cocoa powdered, evaporated milk, vanilla, and 2 cups of powdered sugar to a mixing bowl and beat with electric beaters until smooth. 
  9. Add more powdered sugar, a cup at a time, mixing well, until you reach your desired frosting consistency. I usually use about 3 1/4 cups powdered sugar.
  10. Spread frosting over the cooled brownies and cut into squares. I've found a plastic knife works best to cut them, or if you make them 1 day in advance they are much easier to cut.
Recipe Notes
*If you don't want to use the entire batch of frosting you can store any extra in a tupperware in your fridge for several weeks, or you can freeze it.