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Crispy Peanut Butter Brownie Bars

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  • Prep 15 min
  • Total 3 hr 0 min
  • Servings 18
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Why choose between crispy treats and brownies when you can have both? These easy chocolate-peanut butter bars combine two favorites into one tasty dessert.
by: Girl vs Dough
Updated May 17, 2022
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Brownie layer

  • 1 box Betty Crocker™ Dark Chocolate Fudge Brownie Mix
  • 1/2 cup vegetable oil
  • 1/4 cup water
  • 3 eggs, divided
  • 1/3 cup creamy peanut butter
  • 1/3 cup packed brown sugar

Crispy treat layer

  • 3 tablespoons unsalted butter
  • 10 oz mini marshmallows OR 1 (7 oz) container marshmallow crème
  • 1/2 cup creamy peanut butter
  • 6 cups crisp rice cereal
  • 1/2 cup mini chocolate chips


  • 1
    Heat oven to 350°F. Line a 13-by-9-inch pan with foil, then spray bottom only of pan with cooking or baking spray.
  • 2
    In a large bowl, stir brownie mix, oil, water and 2 eggs until just combined. In a separate medium bowl, stir remaining egg, peanut butter and brown sugar until well combined.
  • 3
    Pour and spread half of brownie batter into prepared pan. Top randomly with tablespoonfuls of the peanut butter mixture, then randomly with tablespoonfuls of the remaining brownie batter. Run a knife a few times through batter to create swirls. Bake brownies 30 to 40 minutes until a toothpick inserted in center comes out clean.
  • 4
    As soon as brownies come out of oven, make crispy treat layer. In a large saucepan over low heat, melt butter. Stir in marshmallows or marshmallow crème until melted. Stir in peanut butter, then stir in cereal until well coated.
  • 5
    Carefully and gently spread and press cereal mixture into an even layer on top of warm brownies. Sprinkle with mini chocolate chips. Let set until treats are fully cooled before slicing.

Nutrition Information

No nutrition information available for this recipe

More About This Recipe

  • These bars are so easy and such a fun twist on the expected. Peanut butter and chocolate, crispy bars and brownies… with this easy and delicious dessert, you don’t have to choose. You can have them ALL. Words escape me, really, whenever I think about how to describe these bars. They're just so tasty that once I see them or hear about them or read about them or even think about them, all I can do is drool and say, “MUST HAVE ONE.” Okay, okay, you’re right – “MUST HAVE FIVE.” Good thing their name pretty much describes all of their goodness. Right? Right?? A layer of peanut butter-swirled dark chocolate brownies is topped with peanut buttery crispy treats and mini chocolate chips. Yeah, they’re pretty much amazing. And the best part is they’re easy to make and you probably have everything on hand you’d need to make them, too. Holla hands emoji! That peanut butter fudge swirly brownie goodness with a crunchy, crispy, chewy, gooey peanut butter chocolate chippy topping… like I said, there are no words. So let’s just get to eating already.
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