Chocolate Peanut Butter Cookie Bars

These cookie bars will have you celebrating every time you make them! My simple to make Gooey Chocolate Peanut Butter Cookie Bars are great to take to parties, you’re in for a treat!!

If you love cookie bars like we do, try our Fruity Pebbles Cookie Bars too!

cookie bars cut into squares on parchment paper

Cookie Bars

Oh how I love chocolate and peanut butter together. My cookie bars are perfect for taking to potlucks or any party! I’ve combined my peanut butter cookie dough from last week with a cake mix I turned into the chocolate cookie layer and topped it with marshmallows and chocolate chips. I’m in love with these bars!

Why You’ll Love This Recipe

  • Only A Few Ingredients To Get. This simple cookie bar recipe just has a few ingredients which makes it a breeze to make!
  • Chocolate Peanut Butter Combo. Not sure there is a better flavor combination than chocolate and peanut butter. These bars will quickly become your new favorite treat to make.

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cookie dough pressed into baking dish for cookie dough

What You’ll Need

Here are the ingredients you’ll need to make these chocolate peanut butter bar cookies at home. See the recipe card located at the bottom of the post for full details.

  • Peanut Butter Cookie Dough– You can use a refrigerated cookie dough from the grocery store or make your own.
  • Devil’s Food Cake Mix– Find cake mixes in the baking section of the grocery store.
  • Butter– I use salted butter for my recipes. Unsalted is fine too.
  • Egg– For consistency, I use large eggs in my cooking and baking.
  • Mini Marshmallows– Find mini marshmallows in the baking section of the grocery store.
  • Chocolate Chips– Milk chocolate or semi-sweet chocolate chips work great in the recipe.

How To Make Chocolate Peanut Butter Cookie Bars

Preheat Oven and Prepare Baking Dish. Preheat oven to 350 degrees F. and line 9 x 13 inch baking dish with parchment paper.

Peanut Butter Cookie Dough Layer. Press peanut butter cookie dough layer into baking dish. I used THIS recipe. Use whatever peanut butter cookie dough recipe you’d like.

Prepare Cake Mix Dough. Place cake mix, butter and egg into a large bowl. Mix until dough consistency forms. Press over peanut butter cookie layer.

Marshmallows. Top with marshmallows and chocolate chips.

Bake. Bake for 35-40 minutes until baked through. Let cool completely then cut into bars and serve room temperature.

chocolate peanut butter cookie bars cut into squares on parchment paper

Recipe Tips For Success

  • Prepare Cookie Dough Ahead of Time. If you can make your peanut butter cookie dough ahead of time, you’ll find this will save lots of time the day you plan to bake the recipe.
  • Use Store Bought Cookie Dough If Needed. If you don’t feel like making your own cookie dough, you can run up to the grocery store and get some store bought peanut butter cookie dough that will work just fine too.
  • Use A Plastic Knife. You will find that by using a plastic knife to cut your bars into squares, it prevents sticking.
cookie bars cut into squares on parchment paper

How To Serve

Serve these gorgeous bar cookies cut into squares served room temperature or slightly warmed for your next party or family dinner.

Leftovers

Store any leftover cookie bars in an airtight container for up to 3 days.

Try More Easy Cookie Bars Recipes

Gooey Chocolate Peanut Butter Cookie Bars

Gooey Chocolate Peanut Butter Cookie Bars

These Gooey Chocolate Peanut Butter Cookie Bars are perfect for potlucks—or just because!
Course: Dessert
Cuisine: American
Prep Time 10 minutes
Cook Time 40 minutes
Total Time 50 minutes
Servings: 12 servings
Calories: 261kcal
Author: Jenny
Cost: $30
Print Pin Rate

Equipment

  • Oven
  • 9 x 13 inch baking dish
  • parchment paper
  • mixing bowl
  • mixing spoon
  • measuring cups
  • measuring spoons
  • plastic knife

Ingredients

  • 2 cups prepared peanut butter cookie dough
  • 1 box Devil’s Food Cake Mix
  • 1 stick salted butter softened
  • 1 large egg
  • 2 cups mini marshmallows
  • 1 cup milk chocolate chips

Instructions

  • Preheat oven to 350 degrees F. and line 9 x 13 inch baking dish with parchment paper.
  • Press peanut butter cookie dough layer into baking dish. Use whatever peanut butter cookie dough recipe you’d like. Place cake mix, butter and egg into a large bowl. Mix until dough consistency forms. Press over peanut butter cookie layer. Top with marshmallows and chocolate chips.
  • Bake for 35-40 minutes until baked through. Let cool completely then cut into bars and serve room temperature.

Notes

  • Prepare Cookie Dough Ahead of Time. If you can make your peanut butter cookie dough ahead of time, you’ll find this will save lots of time the day you plan to bake the recipe.
  • Use Store Bought Cookie Dough If Needed. If you don’t feel like making your own cookie dough, you can run up to the grocery store and get some store bought peanut butter cookie dough that will work just fine too.
  • Use A Plastic Knife. You will find that by using a plastic knife to cut your bars into squares, it prevents sticking.

Nutrition

Calories: 261kcal | Carbohydrates: 43g | Protein: 3g | Fat: 9g | Saturated Fat: 3g | Cholesterol: 16mg | Sodium: 319mg | Potassium: 123mg | Fiber: 1g | Sugar: 27g | Vitamin A: 55IU | Vitamin C: 0.1mg | Calcium: 73mg | Iron: 1.9mg
Keywords: chocolate peanut butter dessert, cookie bars, ooey gooey bars
photo collage of chocolate peanut butter cookie bars

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15 Responses
  1. Abby (@ No Fail Recipes)

    I made this for dessert yesterday and it was very good. I did add some peanut butter and butter scotch chips just because I had them.

  2. Robin @ Simply Southern Baking

    Just saw these in my email. Oh my goodness Jenny. I could eat these for breakfast this morning!

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