Peanut Butter Mud Bars

Peanut Butter Mud Bars are a fantastic combination of all things chocolate and peanut butter!

Peanut Butter Mud Bars on a white plate

I’ve been re-visiting some of my favorite cookbooks lately. I don’t have a vast collection, but it’s large enough that some get a little lost occasionally. The positive side to that is that when you find a formerly lost one, it’s a bit like getting a new cookbook… for free!

I happened upon this Peanut Butter Mud Bars recipe while re-discovering The Buttercup Bakeshop Cookbook. Of course, it had me at peanut butter. Then, I read the description that stated that these are a favorite at the bakery. With that kind of endorsement, I started rounding up ingredients. Luckily, these are all ingredients that most of us probably have in our pantries all the time.

Peanut Butter Mud Bars served on a white plate

There are a lot of flavors at work here – peanut butter, chocolate, brown sugar, white chocolate, pecans. But, somehow it’s not overkill. Everything plays quite well together. Honestly, I didn’t really taste the pecans. They do add some crunch, but I also think that peanuts or crunchy peanut butter would do the same thing. I certainly never avoid pecan usage in my baking, so I was glad to use them and probably would again.

I actually made these twice within just a few days. They are really that good. I added a few more chips on top, mostly for aesthetic purposes. Although, I’ll certainly not complain about a little extra chocolate when given the opportunity.

Find more bar recipes in the Recipe Index.

More Chocolate and Peanut Butter Bar Recipes

Yield: 24 2-inch squares

Peanut Butter Mud Bars

Prep Time 20 minutes
Cook Time 30 minutes
Total Time 50 minutes

Peanut butter and chocolate lovers will adore these Peanut Butter Mud Bars!

Peanut Butter Mud Bars on a white plate


  • 1 cup (240g) all-purpose flour
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1/2 cup (113g) unsalted butter, softened
  • 1 cup (200g) firmly packed light brown sugar
  • 1/2 cup (127g) creamy peanut butter
  • 1 large egg, at room temperature
  • 1 teaspoon vanilla extract
  • 3/4 cup (127g) + 2 tablespoons chocolate chips, divided
  • 1/4 cup (42g) + 2 tablespoons white chocolate chips (or vanilla chips), divided
  • 1/2 cup (83g) + 2 tablespoons peanut butter chips, divided
  • 1/4 cup (42g) coarsely chopped pecans


  1. Preheat oven to 325°F. Grease and lightly flour a 9″x 13″ baking pan.
  2. Whisk together the flour, baking soda, and salt. Set aside.
  3. Using an electric mixer on low speed, beat the butter and brown sugar until fluffy (about 2-3 minutes). Add the peanut butter and beat well. Mix in the egg and vanilla.
  4. Reduce mixer speed to low. Gradually add the dry ingredients and mix well. Stir in 1/2 cup chocolate chips, 1/4 cup white chocolate chips, 1/4 cup peanut butter chips, and pecans.
  5. Spread the mixture evenly into the prepared pan. Bake 25-30 minutes, or until lightly browned.
  6. Remove from the oven and sprinkle 1/4 cup chocolate chips and 1/4 cup peanut butter chips on top of the bars. Allow to sit for 1-2 minutes. Using a spatula, smooth out the chips as they begin to melt.
  7. Cool for 20 minutes. Sprinkle with the remaining 2 tablespoons each chocolate chips, white chocolate chips, and peanut butter chips. Cool completely before cutting into bars.


Recipe slightly adapted from The Buttercup Bake Shop Cookbook.

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