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No Bake Peanut Butter Oatmeal Bars

We can't resist these No Bake Peanut Butter Oatmeal Bars with chocolate frosting and pieces of Reese’s cups on top! They are so easy to make and a family favorite. 
Prep Time 20 minutes
Author rob


  • 1/2 cup sugar
  • 3/4 cup light brown sugar
  • 1/3 cup unsalted butter
  • 1/8 tsp salt
  • 2/3 cup creamy peanut butter
  • 1/3 cup milk
  • 2 - 2 1/2 cups quick cooking oats
  • 1 tsp vanilla extract
  • for chocolate frosting
  • 1 cup semi sweet chocolate chips
  • 1/4 cup creamy peanut butter
  • 4 Reese's cups chopped


  1. Line a 11 x 7 inches pan with parchment paper and set aside.

    In a sauce pan over medium heat, combine butter,  brown sugar, sugar milk and salt. Whisking constantly bring the mixture to a boil. The mixture will boil quickly so keep an eye on it. Boil for 1 minute then remove the pan from a heat.

    Add peanut butter and vanilla and whisk until combine.

    Using a spoon, fold in the oats. Do not add all oats at once. Add 2 cups, stir well, then add ¼ cup at the time if needed. I use 2 1/4 cups. even though the mixture looks looks wet it will harden up. 

    Pour mixture into pan and spread it out evenly. Place in fridge while you make the frosting. 

    To make the chocolate frosting, combine ¼ cup peanut butter and  chocolate chips in a microwave safe bowl and microwave for 30 seconds then stir. Microwave again for 15 seconds intervals. I only need 45 seconds and it is perfect.   

    Spread chocolate frosting over the peanut butter oatmeal bars, sprinkle with chopped Reese’s cups and refrigerate for 1 -2 hours before cutting.