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Reese's Peanut Butter Oatmeal Bars
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5 from 1 vote

Reese's Peanut Butter Oatmeal Bars Recipe

These thick and chewy Reese's peanut butter oatmeal bars are topped with a swirl of chocolate and peanut butter and studded with chunks of peanut butter cups. They're a peanut butter lover's dream!
Prep Time10 mins
Cook Time22 mins
Total Time32 mins
Course: Brownies & Bars, Dessert
Cuisine: American
Servings: 24 bars
Calories: 359kcal
Author: Life Made Simple Team


  • 1 cup granulated sugar
  • 1 cup brown sugar packed
  • 1 cup peanut butter creamy or chunky
  • 3/4 cup (1 1/2 sticks) butter room temperature
  • 1 tsp vanilla
  • 2 eggs
  • 2 cups all-purpose flour
  • 1 1/2 cups quick rolled oats
  • 1 tsp baking soda
  • 1/2 tsp salt

Peanut Butter Topping

  • 1/2 cup peanut butter
  • 2 cups powdered sugar
  • 1/3 cup milk
  • 1 cup chocolate chips (milk or semi-sweet)
  • 5 Reese's peanut butter cups chopped


  • Preheat oven to 350 degrees. Lightly grease (or cover with parchment) a 9X13 baking pan, set aside.
  • In the bowl of a stand mixer, cream the sugars, butter and peanut butter for 1 minute. Turn speed to low and add one egg at a time. Add vanilla and mix until combined.
  • In a medium size mixing bowl, whisk together the oats, flour, baking soda and salt. With mixing speed on low, gradually add the dry ingredients until just combined.
  • Pour dough into the prepared pan and pat down until an even layer is formed. Place in the oven and bake for 22-28 minutes, or until the top begins to brown.
  • Meanwhile, in a medium size mixing bowl, combine all of the topping ingredients. Using a hand mixer, beat until smooth (it should be a spreadable consistency, but will it will also melt and get shiny on contact). Set aside until needed.
  • Remove bars from oven and place pan on a wire rack. Sprinkle chocolate chips over top, then pour on the topping, swirl and spread into an even layer. Top with chunks of peanut butter cups, pressing them in to the topping. Allow to cool for 30 minutes (or refrigerate until the topping is solid) before cutting into bars.


-Bars should be stored in an airtight container for up to 5 days.


Serving: 1bar | Calories: 359kcal | Carbohydrates: 47g | Protein: 7g | Fat: 17g | Saturated Fat: 7g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 6g | Trans Fat: 1g | Cholesterol: 31mg | Sodium: 243mg | Potassium: 170mg | Fiber: 2g | Sugar: 33g | Vitamin A: 205IU | Vitamin C: 1mg | Calcium: 29mg | Iron: 1mg