Introduction
A warm, dense bar that marries the roast of peanut and the bittersweet hush of chocolate — these brownies smell like late afternoons and careful hands. The layers fold into a comforting contrast of silky ganache and a tender peanut butter heart, a duet you can almost hear. For a companion recipe that complements this flavor, consider these chocolate peanut butter cheesecake bars for a creamy counterpart.
Why make this recipe
Because some recipes are invitations: to slow time, to temper heat with patience, to anchor a celebration in something you can hold. These Peanut Butter Brownies bring bright pockets of peanut butter into a velvet chocolate matrix — a crowd-pleaser that reads like a small, precise indulgence. If you enjoy exploring the peanut-chocolate realm further, the same profile appears with a different rhythm in another favorite: chocolate peanut butter cheesecake bars.
How to make Peanut Butter Brownies
This recipe layers a simple, glossy brownie batter around a creamy peanut butter filling and finishes with a shiny bittersweet ganache. Respect the contrasts: don’t rush cooling, and let the ganache settle so each slice reveals clean strata. For techniques that help with peanut-swirled fillings in other desserts, you might find inspiration from an easy, no-bake option like easy peanut butter pie.
Ingredients:
- 3/4 cup peanut butter
- 1/2 cup granulated sugar
- 1 egg (room temperature)
- 12 oz semi-sweet or bittersweet chocolate chips
- 6 tbsp unsalted butter (cut into small cubes)
- 3/4 cup granulated sugar
- 1 tsp vanilla extract
- 3 eggs (room temperature)
- 1/4 cup unsweetened cocoa powder
- 1/3 cup cornstarch
- 1/2 tsp salt
- 1 cup mini semi-sweet chocolate chips
- 10 oz bittersweet chocolate (chopped)
- 1/2 cup heavy whipping cream
Directions:
- Preheat oven to 350F. Lightly spray a 9-inch square baking pan with cooking spray and line with parchment paper for easy removal. Set aside.
- For the Peanut Butter Filling, mix peanut butter, sugar, and egg in a medium bowl until well combined. Set aside.
- For the Brownies, combine chocolate chips and butter in a large bowl. Melt in the microwave in 30-second increments, stirring in between.
- Stir in sugar and vanilla until combined, then add eggs one at a time, mixing between additions.
- In a separate bowl, whisk together cocoa powder, cornstarch, and salt, then add to the wet mixture and mix until smooth.
- Stir in mini chocolate chips. Pour two-thirds of brownie batter into prepared pan. Drop spoonfuls of peanut butter mixture on top, then add remaining brownie batter. Smooth the top.
- Bake for 33-37 minutes, checking doneness with a toothpick.
- Let cool completely on a cooling rack or in the fridge.
- For the Ganache, place bittersweet chocolate in a bowl. Heat whipping cream until scalding, pour over chocolate, and let sit for 5 minutes. Stir until smooth.
- Pour ganache over brownies and spread until smooth. Refrigerate until set. Cut into bars and serve. Store in an airtight container in the refrigerator.
How to serve Peanut Butter Brownies
Serve chilled or at cool room temperature so slices hold their clean edges. A thin sliver warmed briefly in the microwave (5–8 seconds) revives the ganache’s gloss and softens the center, making each bite molten and tactile. Pair with a small cup of intensely brewed coffee or a cooling glass of milk to balance the bittersweet notes.
How to store Peanut Butter Brownies
These keep beautifully in the refrigerator in an airtight container for up to one week. For longer storage, freeze individual bars wrapped tightly in plastic and foil for up to three months; thaw overnight in the refrigerator for the best texture.
Tips to make Peanut Butter Brownies
- Use room-temperature eggs for a smoother batter and more even rise.
- Chop your bittersweet chocolate uniformly so it melts evenly into the ganache.
- When assembling the peanut butter filling, don’t overmix; a few gentle strokes maintain a silkier texture.
- If your ganache is too thick to pour, warm it gently over a bain-marie or microwave in 10-second bursts, stirring between each.
- For cleaner slices, chill the set ganache thoroughly and warm a sharp knife under hot water, wiping it dry between cuts.
Variations (if any)
- Swirled peanut butter: Reserve a few tablespoons of peanut butter filling and swirl with a knife through the top layer before baking for a marbled effect.
- Nutty crunch: Fold 1/2 cup toasted chopped peanuts into the brownie batter for texture.
- Salted finish: Sprinkle flaky sea salt atop the ganache for a bright counterpoint to the chocolate.
- Milk chocolate twist: Substitute milk chocolate for the ganache if you prefer a softer, sweeter finish.
FAQs
Q: Can I use natural peanut butter or does it affect the texture?
A: Natural peanut butter often contains more oil and less emulsifiers; it will work but may make the filling softer and slightly runnier. Chill the filling longer before assembling if using natural peanut butter.
Q: Can I make these gluten-free?
A: The recipe as written is effectively gluten-free if your cocoa powder and other ingredients are certified gluten-free. Ensure all packaged items are labeled gluten-free. The cornstarch helps with structure in place of flour.
Q: How can I tell when the brownies are done without overbaking?
A: Insert a toothpick near the center. You want a few moist crumbs clinging to it — not raw batter. The top should be set and glossy before cooling.
Q: Can I omit the ganache?
A: Yes. Omit the ganache and allow the brownies to cool and set for a fudgier, simpler finish. A light dusting of cocoa or powdered sugar adds a gentle flourish.
Q: Will these freeze well after baking?
A: Yes — freeze individual bars wrapped airtight for up to three months. Thaw slowly in the refrigerator for the best texture.
Conclusion
For a tested take on the peanut butter brownie idea that emphasizes texture and proportion, I often consult Preppy Kitchen’s Peanut Butter Brownies for technique notes. For another well-loved variation and helpful tips, see Brown Eyed Baker’s Peanut Butter Brownies for inspiration and comparison.
Baking asks for patience and reverence; each quiet minute yields a sweeter clarity.

Peanut Butter Brownies
Ingredients
Method
- Preheat oven to 350°F. Lightly spray a 9-inch square baking pan with cooking spray and line with parchment paper.
- In a medium bowl, mix the peanut butter, sugar, and egg until well combined for the Peanut Butter Filling. Set aside.
- In a large bowl, combine chocolate chips and butter. Melt in the microwave in 30-second increments, stirring in between.
- Stir in sugar and vanilla until combined, then add eggs one at a time, mixing between additions.
- In a separate bowl, whisk together cocoa powder, cornstarch, and salt. Add to the wet mixture and mix until smooth.
- Stir in mini chocolate chips. Pour two-thirds of brownie batter into the prepared pan.
- Drop spoonfuls of peanut butter mixture on top, then add remaining brownie batter. Smooth the top.
- Bake for 33-37 minutes, checking doneness with a toothpick.
- Let cool completely on a cooling rack or in the fridge.
- For the Ganache, place bittersweet chocolate in a bowl. Heat whipping cream until scalding, pour over chocolate, and let sit for 5 minutes. Stir until smooth.
- Pour ganache over brownies and spread until smooth. Refrigerate until set.
- Cut into bars and serve.