clock clock iconcutlery cutlery iconflag flag iconfolder folder iconinstagram instagram iconpinterest pinterest iconfacebook facebook iconprint print iconsquares squares iconheart heart iconheart solid heart solid icon
peanut butter brownies

Peanut Butter Brownies with Brownie Mix

5 Stars 4 Stars 3 Stars 2 Stars 1 Star

4.8 from 36 reviews

  • Author: Liz Thomson
  • Total Time: 35 minutes
  • Yield: Serves 18 1x


These peanut butter brownies are the ultimate treat. You’ll be amazed at how easy it is to make peanut butter brownies from a boxed mix!


  • 18.3oz box brownie mix
  • 1/4 cup water
  • 1/2 cup vegetable oil
  • 2 eggs
  • 1/2 cup dark chocolate chips
  • 3/4 cup creamy peanut butter


  1. Preheat the oven to 350 degrees.
  2. Spray a 9×13 pan with non-stick spray.
  3. In a large bowl, combine the brownie mix, water, oil, eggs, and chocolate chips until combined.
  4. Microwave the peanut butter for 30 seconds, until slightly melted.
  5. Drizzle the peanut butter over the unbaked brownies and use a knife to swirl it into the top of the batter.
  6. Bake for 28-30 minutes or until a toothpick inserted into the brownies comes out clean.
  • Prep Time: 5 minutes
  • Cook Time: 30 minutes
  • Category: Dessert
  • Method: Oven
  • Cuisine: American