Peanut Butter-Oatmeal Brownies With Peanut Butter Frosting

“The trick with these is not to overbake, throw in some chocolate or peanut butter baking chips if desired :) You could mix this by hand, but there is a lot of dough and it is quite thick so I recommend using a stand mixer to mix the batter, if you prefer a really sweet bar then increase the brown sugar to 1-1/4 cups.”

Ingredients Nutrition


  1. Set oven to 350 degrees.
  2. Set oven rack to second-lowest position.
  3. Grease a 13 x 9-inch baking pan.
  4. In a large bowl using an electric mixer cream the butter or margarine with white and brown sugar until well creamed.
  5. Mix in the peanut butter.
  6. Add in eggs and maple or vanilla extract; mix until well blended (about 3 minutes).
  7. In a bowl combine the flour with oats, baking soda and cinnamon; add to the creamed mixture and mix until well combined.
  8. Mix in chopped peanuts.
  9. Transfer to baking dish, then spread out evenly (the mixture will be quite thick so use you hands to spread in the dish).
  10. Bake for about 20-22 minutes.
  11. Cool completely before frosting.
  12. For the frosting; in a bowl beat butter or margarine and peanut butter until fluffy using an electric mixer.
  13. Gradually mix in confectioners sugar, when the mixture stars to get thick add in the milk or cream a tablespoon at a time until a desired spreadable consistency is achieved.
  14. Spread over the cooled brownies.
  15. Cut into bars.

Join the Conversation

  • all
  • reviews
  • tweaks
  • q & a