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    Home » Desserts

    Peanut Butter Brownies From Brownie Mix

    Published: Apr 1, 2022 · Modified: Apr 1, 2022 by Nora Rey · This post may contain affiliate links · Leave a Comment

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    These peanut butter brownies from brownie mix are definitely a winner — fudgy brownies stuffed with sweet and salty peanut butter filling.

    Six slices of peanut butter brownie bars on parchment paper.

    You can also upgrade your boxed brownies in seven other ways:

    • Cheesecake Brownie from Brownie Mix
    • Brookie Bars from Brownie Mix
    • Oreo Brownies from Brownie Mix
    • Nutty Brownies from Brownie Mix
    • S'mores Brownies from Brownie Mix
    • Salted Caramel Pretzel Brownies from Brownie Mix
    • Birthday Brownies from Brownie Mix
    Jump to:
    • Ingredients you'll need
    • Tips for best brownies
    • How to make this recipe
    • How to serve and store
    • Frequently asked questions
    • More about brownies
    • Watch how I make it here
    • Other dessert recipes you may like
    • 📖 Recipe

    Ingredients you'll need

    For the brownie layer

    Individual ingredients for the brownie layer.

    Extra ingredients

    Extra ingredients for the peanut butter brownies in individual containers.

    Notes and substitutions

    • Brownie mix: Use a regular-size (about 18 ounces) boxed brownie.
    • Water: Use milk, buttermilk, or brewed coffee instead of water to add richness and flavor.
    • Instant coffee: An optional ingredient that enhances the chocolate flavor and tames the sweetness of the brownies.

    Tips for best brownies

    • Bring the eggs to room temperature and lightly beat them to ensure they get incorporated well without overmixing.
    • Grease and line the pan with parchment paper so the brownies will not stick and come out easily.
    • Check the brownies two minutes before they should be done. Test with a toothpick — it should come out with several separate crumbs for fudgy brownies and less for cakey.
    • Cool the brownies before slicing. Refrigerating them improves their texture.

    How to make this recipe

    (1)Make the brownie batter as directed in the package and spread it on a 9x9-inch pan. (2)In a small bowl, mix the peanut butter and powdered sugar until smooth. Warm the peanut butter in the microwave, if it's too thick.

    Brownie batter in the pan. Mixing the peanut butter mixture in the bowl.

    (3)Mix spoonfuls of the peanut butter mixture into the brownie batter. (4)Bake as directed.

    Tucking the peanut butter mixture in the brownie batter using a chopstick. Baked peanut butter brownies in the pan.

    How to serve and store

    Let the peanut butter brownies set for at least an hour in the fridge before cutting. Refrigerate leftovers and consume within five to seven days.

    You can freeze them for up to three months if wrapped properly. Let them thaw in the fridge or at room temperature.

    Slices of peanut butter brownies on parchment paper.

    Frequently asked questions

    Why do eggs need to be at room temperature for baking?

    Eggs at room temperature blend evenly with other ingredients. Baked goods will rise evenly and have a uniform texture.

    What is the best oil for baking?

    Use a neutral-flavored oil for baking, such as canola or other vegetable oils. I also like mild-tasting oils like avocado oil, olive oil, and coconut oil.

    Can I double this peanut butter brownie recipe?

    Yes! You can easily double this recipe and bake it in a 9x13-inch pan.

    More about brownies

    If you'd like to know more, here are frequently asked questions on brownies including extra tips, troubleshooting, and more.

    Watch how I make it here

    Other dessert recipes you may like

    • Cheesecake Brownies from Brownie Mix
    • Brookie Bars from Brownie Mix
    • Oreo Brownies From Brownie Mix
    • Nutty Brownies From Brownie Mix
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    Did you make this recipe? I would love to know! Your feedback helps me make better recipes.  Please rate, review, or comment below. Questions about this recipe are welcome, too!

    Let's connect on Facebook, Instagram, Pinterest, TikTok, Twitter, and Youtube. Be sure to tag me when you try any of my recipes @recipesbynora!

    📖 Recipe

    peanut butter brownies on a parchment paper

    Peanut Butter Brownies from Brownie Mix

    These peanut butter brownies from brownie mix are definitely a winner — fudgy brownies stuffed with sweet and salty peanut butter filling.
    5 from 1 vote
    Print Pin Rate
    Course: Dessert
    Cuisine: American
    Prep Time: 5 minutes
    Bake Time: 25 minutes
    Total Time: 30 minutes
    Servings: 16
    Calories: 118kcal
    Author: Nora Rey
    Cost: $2-$4

    Equipment

    • 9x9-inch pan

    Ingredients

    For the brownie base (see package instructions)

    • brownie mix about 18 ounces
    • eggs room temp & lightly beaten
    • water sub: milk, buttermilk, or coffee
    • oil (canola, olive, or other vegetable oils)
    • ½ teaspoon instant coffee or ¼ teaspoon espresso powder optional

    For the peanut butter mixture

    • ¾ cup peanut butter (190 grams) salted (or add a pinch of salt)
    • ¼ cup powdered sugar (29 grams)

    Instructions

    • Make the brownie batter as directed in the package and spread it on a 9x9-inch pan.
    • In a small bowl, mix the peanut butter and powdered sugar until smooth. Slightly warm the peanut butter in the microwave, if it's too thick.
    • Mix spoonfuls of the peanut butter mixture into the brownie batter.
    • Bake as directed.
    • Refrigerate for at least an hour before cutting.

    Video

    Notes

    Tips for best brownies:
    • Bring the eggs to room temperature and lightly beat them to ensure they get incorporated well without overmixing.
    • Grease and line the pan with parchment paper so the brownies will not stick and come out easily.
    • Check the brownies two minutes before they should be done. Test with a toothpick — it should come out with several separate crumbs for fudgy brownies and less for cakey.
    • Cool the brownies before slicing. Refrigerating them improves their texture.

    Nutrition

    Calories: 118kcalCarbohydrates: 4gProtein: 4gFat: 10gSaturated Fat: 2gPolyunsaturated Fat: 3gMonounsaturated Fat: 5gTrans Fat: 1gCholesterol: 20mgSodium: 64mgPotassium: 87mgFiber: 1gSugar: 3gVitamin A: 30IUCalcium: 8mgIron: 1mg
    Tried this Recipe? Pin it for Later!Mention @recipesbynora or tag #RecipesByNora!
    « Nutty Brownies From Brownie Mix
    Oreo Brownies From Brownie Mix »
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