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    Home » Recipes » Bars and Brownies

    Peanut Butter Brownie Bars

    October 18, 2021 | Heather Warburton

    Jump to Recipe Print Recipe
    Peanut butter brownie bars sliced on sheet pan and 3 bars stacked next to other sliced bars on sheet pan.

    This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases at no extra cost to you. Click HERE to read my policies.

    These Peanut Butter Brownie Bars have a simple homemade brownie on the bottom with a creamy peanut butter filling and a dark chocolate ganache topping. A decadent and rich dessert everyone is going to love, especially the chocolate and peanut butter lovers!

    This dessert is hands down the best peanut butter and chocolate combination I have created yet! Sweet deliciousness in every bite! It's a layer bar, but is so simple to make! It is a great make ahead dessert, and would be perfect for any BBQ, picnic or holiday celebration!

    Peanut butter brownie bars sliced and stacked 3 high next to more bars.

    This post was originally posted on 7/8/2016 and updated on 10/18/2021.

    Peanut Butter Brownie Bars Recipe Ingredients

    Brownie Layer

    • Salted Butter
    • Cocoa Powder
    • Sugar
    • Eggs
    • Pure Vanilla Extract
    • Unbleached All Purpose Flour

    Peanut Butter Filling

    • Salted Butter
    • Creamy Peanut Butter
    • Pure Vanilla Extract
    • Powdered Sugar

    Chocolate Ganache Topping

    • Dark Chocolate Chips
    • Heavy Cream

    Substitution Suggestions:

    • Salted Butter: Feel free to use unsalted butter and add ½ teaspoon salt to the brownie batter and ¼ teaspoon salt to the peanut butter filling.
    • Unbleached All Purpose Flour: Whole wheat flour and white whole wheat flour works really well in this brownie recipe.
    • Creamy Peanut Butter: We prefer a smooth peanut butter filling, but if you want a little crunch you can use crunchy peanut butter filling.
    • Dark Chocolate Chips: Milk chocolate or semi-sweet chocolate chips can be used.

    How to Make Peanut Butter Brownie Bars

    1. Star with the brownie batter, whisk together the melted butter and cocoa powder until smooth.
    2. Add the sugar and combine well.
    3. Add the eggs and vanilla extract and whisk until completely smooth.
    • Brownie layer ingredients.
    • Brownie wet ingredients mixed together in large glass mixing bowl.
    1. Stir in flour just until fully incorporated.
    2. Spread batter into a parchment lined and greased 9x13 baking dish.
    3. Bake brownies at 350°F for 20-25 minutes until the edges are started to pull away from the sides of the dish.
    4. Let brownies cool at least 15-20 minutes before adding filling and topping.
    • Dry ingredients added to complete brownie batter.
    • Brownie batter spread evenly into baking dish.
    1. While the brownies are cooling, make the peanut butter filling. In a stand mixer beat together the melted butter, peanut butter, vanilla extract and powdered sugar until everything is evenly combined.
    • Peanut butter filling and chocolate topping ingredients.
    • Peanut butter filling in mixing bowl.
    1. Dollop the peanut butter over the cooked and cooled brownies.
    2. Spread the filling out evenly over the brownies. Your fingers or an off set spatula works the best.
    • Peanut butter filling dolloped on top of cooked brownies.
    • Peanut butter filling spread out evenly over brownies.
    1. In a microwave safe bowl, melt the chocolate chips and cream together for 30 seconds. Melt in 10 second intervals after that if needed.
    2. Spread the chocolate over the peanut butter filling evenly. Work quickly because the ganache will set fast.
    • Chocolate ganache topping in small bowl with spatula.
    • Chocolate ganache spread over peanut butter filling.
    1. Chill the bars in the fridge for at least an hour.
    2. Slice, serve and enjoy!
    Top view of peanut butter brownie bars sliced on sheet pan.

    How to Store Peanut Butter Brownie Bars

    Storing: These bars are best stored in an air tight container in the fridge. They can also be stored at room temperature, but we really like these better when they are chilled.

    Freezing: Freeze bars in an air tight container or zip top bag between layers of wax paper for up to 4 months. These bars are great for freezing individually as well. Wrap each bar in plastic wrap and then place in freezer bag or container. Remember to label and date the container or bag.

    Thawing: Simply thaw the bars in the fridge or at room temp for a few hours before serving.

    Tips and Tricks

    • No need for any leavening agent in these brownies. It will make them puff up too much creating a cake like texture rather than chewy, so skip the baking powder and baking soda.
    • Want a little crunch in these bars, try using crunchy peanut butter in the filling or adding a ½ cup of chopped peanuts to the brownie batter.
    • Let the brownies cool before slicing. Slice with a plastic knife in one smooth cut, do not saw to cut the bars.
    Sliced peanut butter brownie bars on sheet pan with 2 bars on their side showing pretty layers.

    Other Sweet Dessert Bars:

    • Dark Chocolate Walnut Brownies
    • No Bake Peanut Butter Bars
    • Butterscotch Brownies
    • Peanut Butter Cereal Bars
    • Classic Homemade Brownies
    • No Bake Scotcharoos
    • Old Fashioned Frosted Brownies
    • Peanut Butter Banana Brownies
    • Rocky Road Brownies
    Peanut butter brownie bars sliced and stacked 3 high next to more bars.
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    Peanut Butter Brownie Bars

    These Peanut Butter Brownie Bars have a simple homemade brownie on the bottom with a creamy peanut butter filling and a dark chocolate ganache topping. A decadent and rich dessert everyone is going to love, especially the chocolate and peanut butter lovers!
    Course: Dessert
    Cuisine: American
    Keyword: peanut butter brownie bars
    Prep Time: 20 minutes
    Cook Time: 20 minutes
    plus cooling and chilling: 1 hour 15 minutes
    Servings: 24
    Author: Heather

    Ingredients

    Brownie Batter

    • 1 cup salted butter, melted
    • ½ cup cocoa powder
    • 2 cups sugar
    • 4 large eggs
    • 4 teaspoons pure vanilla extract
    • 2 cups unbleached all purpose flour

    Peanut Butter Filling

    • ¾ cup salted butter, melted
    • 1½ cups creamy peanut butter
    • 1 teaspoon pure vanilla extract
    • 3 cups powdered sugar

    Chocolate Ganache Topping

    • 12 oz dark chocolate chips
    • ¼ cup heavy cream

    Instructions

    • Preheat oven to 350°F and line a 9x13 baking dish with parchment paper and lightly grease the sides.
    • To make the brownies, in a large mixing bowl whisk together the melted butter and cocoa powder until smooth.
    • Add the sugar and mix until well combined.
    • Add the eggs and vanilla extract and whisk until fully incorporated and smooth.
    • Stir in the flour just until combined.
    • Spread batter evenly into baking dish. Bake for 20-25 minutes and until the edges are just starting to pull away from the sides and the middle is no longer glossy looking.
    • Let brownies cool for 15-20 minutes and start the peanut butter filling.
    • In a stand mixer or with hand beaters, beat together the melted butter, peanut butter, vanilla, and powdered sugar until everything is evenly combined.
    • Drop dollops of peanut butter filling on top of the brownies. Spread it out evenly with your fingertips or off set spatula to cover all the brownies.
    • In a microwave safe bowl, melt the chocolate chips and cream together for 30 seconds, stir. Melt in 10 second intervals after that if needed.
    • Spread the chocolate over the peanut butter filling evenly. Work quickly, the ganache will set fast.
    • Chill in refrigerator for at least one hour before serving.
    • Slice and serve!

    Nutrition

    Serving: 1bar | Calories: 478kcal | Carbohydrates: 52g | Protein: 8g | Fat: 28g | Saturated Fat: 15g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 8g | Trans Fat: 1g | Cholesterol: 70mg | Sodium: 221mg | Potassium: 252mg | Fiber: 2g | Sugar: 38g | Vitamin A: 497IU | Vitamin C: 1mg | Calcium: 64mg | Iron: 1mg
    Tried this recipe?Please rate the recipe, leave a comment and tell me how much you loved it!
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    More Bar and Brownie Recipes

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    • Chocolate Chip Cookie Bars Recipe
    • No Bake Lemon Cheesecake Bars
    • S'mores Brownies

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