These amazing Peanut Butter Brownies start with a chewy chocolate brownie recipe topped with creamy peanut butter frosting, chocolate glaze and mini Reese’s peanut butter cups.

A Peanut Butter Brownie on a wire cooling rack with more brownies in the background.

These Peanut Butter Brownies are just as amazing as they look. I like to make them 1 day in advance because I think they taste even better after the brownies have had time to cool in the fridge. You just can’t beat the peanut butter/chocolate combo!

How to make Peanut Butter Brownies:

Make the Brownies:

In a mixing bowl add granulated and brown sugars and melted butter. Beat until well combined. Add eggs and egg yolk, beating after each addition. Add milk and vanilla extract.

In a separate bowl mix together the flour, cocoa powder, baking powder, and salt.
Add dry ingredients to wet ingredients and mix just until combined. The batter will be thick.
Pour batter into a greased 9×13” baking pan and spread into an even layer. Bake at 350 degrees for 35-45 minutes or until a toothpick inserted in the center comes out clean.
Two process photos for making brownie batter and pouring in a 9x13 inch pan.

While brownies cool, make the Peanut Butter Frosting:

Beat together butter, and peanut butter until smooth. Add powdered sugar and vanilla and beat again until smooth. Add a little splash of milk, beating well until light and fluffy. Add more milk or powdered sugar if needed to make the frosting thicker or thinner.
Smooth frosting over the top of cooled brownies. Refrigerate while you make the chocolate topping.
A spatula smoothing peanut butter frosting over brownies next to a photo of chocolate glaze being poured on top of the brownies.

Make the Chocolate Glaze: Place chocolate chips and butter in a microwave safe bowl. Microwave in 30 second intervals, stirring in between, until just melted and smooth. Allow to cool for 3-4 minutes. Spread evenly over the frosted brownies. Add chopped Reese’s chocolate to the top. Return to fridge to allow the chocolate to set. Cut into squares and serve!

A white 9x13 pan with peanut butter brownies with frosting, chocolate glaze and chopped peanut butter cups on top.

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Recipe

A Peanut Butter Brownie on a wire cooling rack with more brownies in the background.
Prep 20 mins
Cook 45 mins
Chill time 30 mins
Total 1 hr 5 mins
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Ingredients
  

Brownies:

  • 1 1/2 cups granulated sugar
  • 1 1/2 cups light brown sugar , packed
  • 1 cup salted butter , melted
  • 4 large eggs
  • 1 large egg yolk
  • 1/3 cup milk
  • 2 teaspoons vanilla extract
  • 2 1/4 cups all-purpose flour
  • 1 cup unsweetened cocoa powder
  • 1/2 teaspoon baking powder
  • dash salt

Peanut Butter Frosting:

  • 1/4 cup butter , room temperature
  • 3/4 cup creamy peanut butter
  • 1 cup powdered sugar
  • 1 teaspoon vanilla extract
  • 1-3 Tablespoons milk , as needed

Chocolate Glaze:

  • 1 cup semi-sweet chocolate chips
  • 5 Tablespoons butter
  • 1 small bag mini Reese's chocolates , unwrapped and chopped

Instructions
 

Brownies:

  • Preheat oven to 350 degrees F. 
  • In a mixing bowl add granulated and brown sugars and melted butter. Beat until well combined. Add eggs and egg yolk, beating after each addition. Add milk and vanilla extract.
  • In a separate bowl mix together the flour, cocoa powder, baking powder, and salt. Add dry ingredients to wet ingredients and mix just until combined. The batter will be thick. 
  • Pour batter into a greased 9x13'' baking pan and spread into an even layer. Bake at 350 degrees for 35-45 minutes or until a toothpick inserted in the center comes out clean. Allow to cool completely.

Peanut Butter Frosting:

  • Beat together butter, and peanut butter until smooth. Add powdered sugar and vanilla and beat again until smooth. Add a little splash of milk, beating well until light and fluffy. Add more milk or powdered sugar if needed to make the frosting thicker or thinner. 
  • Smooth frosting over the top of cooled brownies. Refrigerate while you make the chocolate topping.

Chocolate Glaze:

  • Place chocolate chips and butter in a microwave safe bowl. Microwave in 30 second intervals, stirring in between, until just melted and smooth. Allow to cool for 3-4 minutes. 
  • Spread evenly over the frosted brownies. Add chopped Reese's peanut butter cups on top. Return to fridge to allow the chocolate to set.

Notes

Make ahead Instructions: These brownies taste great made 1-2 days in advance, stored covered in the refrigerator. The peanut butter frosting can be made 1-2 weeks in advance. Bring to room temperature before spreading on brownies. 
Freezing Instructions: Baked and cooled brownies can be frozen for up to 3 months. Thaw overnight in the fridge, or on the counter, before adding frosting and glaze.

Nutrition

Calories: 386kcalCarbohydrates: 48gProtein: 5gFat: 20gSaturated Fat: 10gCholesterol: 68mgSodium: 162mgPotassium: 211mgFiber: 2gSugar: 34gVitamin A: 435IUCalcium: 46mgIron: 1.9mg

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Have you tried this recipe?!

RATE and COMMENT below! I would love to hear your experience.

I originally shared this recipe July 2016. Updated September 2020 with process photos and additional instructions and tips.

Reese's Peanut Butter Brownies are a chocolate and peanut butter lover's dream! Chewy homemade brownies with an amazing smooth peanut butter frosting. Topped with chocolate glaze and mini reese's cups. - Tastes Better From Scratch

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About The Author

Lauren Allen

Welcome! I’m Lauren, a mom of four and lover of good food. Here you’ll find easy recipes and weeknight meal ideas made with real ingredients, with step-by-step photos and videos.

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  1. 3 stars
    More like dry dense cake than brownies. Barely mixed the batter and took 5 minutes of the mminimum cooking time. It’s surprising considering all the fat thath went into the batter! Also the frosting hardens unpleasantly in the fridge in order to spread the chocolate topping. Really not my favorite (and I’ve made a LOT of different kinds of brownies in my life).

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