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Reese's Pieces Oatmeal Bars stacked on a plate.
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5 from 1 vote

Reese's Pieces Peanut Butter Oatmeal Bars

Reese's Pieces Peanut Butter Oatmeal Bars have a rich peanut butter middle encased in 2 layers of oatmeal crumble with lots of Reese's Pieces on top. There's a ton of peanut butter flavor in these bars and they are so buttery and good with a little chewiness from the oats.
Course Dessert
Cuisine Southern
Keyword peanut butter bars
Prep Time 10 minutes
Cook Time 35 minutes
Servings 20
Calories 350kcal


  • 1 cup (2 sticks) butter, melted
  • 1 cup packed light brown sugar
  • 1/2 teaspoon baking soda
  • 1 teaspoon salt
  • 1 1/2 cups all-purpose flour
  • 2 1/4 cups quick-cooking oats
  • 1 (14-ounce) can sweetened condensed milk
  • 1/2 cup creamy peanut butter
  • 1 1/2 cups Reese's Pieces candies


  • Preheat oven to 350 degrees and line a 9X13-inch baking dish with aluminum foil. Coat the foil lightly with cooking spray.
  • In a large bowl, combine melted butter, brown sugar, baking soda, and salt. Use a hand-held mixer to mix everything together.
  • Add flour and oats and mix until blended well.
  • Set aside 1 heaping cup of the oat mixture. Press the remaining into the bottom of the prepared pan. Bake for 10 minutes.
  • Combine sweetened condensed milk and peanut butter in a bowl and mix until blended. Pour mixture over prepared crust, using a spatula to even it out.
  • Sprinkle half of the reserved oat mixture over the peanut butter layer. Then sprinkle the Reese's Pieces over the top.
  • Top with the remaining oat mixture. Bake for about 25 minutes. Let cool before cutting into squares. Store at room temperature in an air tight container or ziptop bag.


Unless otherwise noted, I use salted butter in my recipes.
You can use crunchy peanut butter instead of creamy if you wish.


Calories: 350kcal