Peanut Butter Mud Bars

Peanut Butter Mud Bars are delicious bars packed with chocolate, peanut butter, white chocolate, and nuts. - Bake or Break

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 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 are delicious bars packed with chocolate, peanut butter, white chocolate, and nuts. - Bake or Break

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 can’t complain about a little extra chocolate when given the opportunity.

Peanut Butter Mud Bars

Yield: 24 2-inch squares

Prep Time: 20 minutes

Cook Time: 30 minutes


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


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

Recipe adapted from The Buttercup Bake Shop Cookbook.