This Mississippi Mud Cake is over-the-top decadent with a brownie-like texture, melty soft marshmallows, pecans, and fudgy chocolate frosting. Once you taste your first piece, you will not be able to stop eating!
Combine the first 5 ingredients in a large mixing bowl.
Add butter, eggs, vanilla, and pecans, stir until smooth.
Pour into pan and bake for 25 to 30 minutes or until a wooden pick comes out clean.
Immediately sprinkle marshmallows and bake for another 2 minutes.
Carefully spread frosting over the top. Cool and cut into squares.
For the frosting:
Beat all ingredients with a whisk or electric mixer until spreading consistency.
Notes
Note: I found that you need to add extra milk to get this to be a little more thin than it turns out, otherwise you cannot really spread the frosting over the marshmallows.