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Oatmeal Peanut Butter Chocolate Cookie Bars

Course Dessert
Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Servings 12
Author Joyful Homemaking


  • Wet ingredients:
  • 1/2 cup butter
  • 1/2 cup sugar
  • 1/2 cup brown sugar
  • 1 egg
  • 1 teaspoon vanilla
  • 1/2 cup peanut butter
  • Dry ingredients:
  • 1 cup flour
  • 1/2 cup quick cook oats
  • 1 teaspoon baking soda
  • 1/4 teaspoon salt
  • Middle:
  • 1 cup of chocolate chips
  • Frosting:
  • 1/2 cup plus 1 Tablespoon room temperature butter
  • 1 cup creamy peanut butter
  • 1/4 cup milk plus more if too thick
  • 2 cups powdered sugar


  • It’s three layers: the bottom which is like a giant oatmeal peanut butter cookie, then a layer of chocolate, and it’s topped with homemade peanut butter frosting.
  • Mix wet ingredients together with mixer.
  • Then mix dry ingredients together.
  • Combine wet and dry ingredients and spread in a 9×13 inch greased pan.
  • Bake at 350 degrees for 20 to 25 minutes.
  • When you take out of the oven, sprinkle 1 cup of chocolate chips over the top.
  • After they start to melt, spread them over the top with a spatula.
  • While this cools and the chocolate hardens up, make the peanut butter frosting.
  • Beat peanut butter and butter with mixer, then gradually add powdered sugar and milk alternately.
  • Beat well, till it is fluffy. If it is too thick, try adding a dab more milk.
  • Spread over the cooled chocolate layer.
  • Let them sit for a few minutes at least so everything “sets” and then you are ready to cut into bars and serve.