Peanut Butter Krispie Brownies
If you’re on the hunt for a decadent dessert that combines the rich flavors of chocolate and peanut butter with a delightful crunch, look no further than these Peanut Butter Krispie Brownies. This recipe is a dream come true for those who love a combination of textures—from the fudgy brownie base to the crispy marshmallow topping, every bite is a treat that will make you swoon.
These brownies are perfect for any occasion, whether it’s a cozy night in, a potluck gathering, or simply because you deserve something sweet. They are easy to make, require minimal ingredients, and will have everyone asking for seconds. Let’s dive into why you’ll fall in love with this recipe!
Why I Love This Recipe
Peanut Butter Krispie Brownies are an ultimate indulgence that ticks all the right boxes. The combination of soft, cake-like brownies with a chewy, crunchy topping creates a delightful contrast that is hard to resist. The richness of the peanut butter elevates the chocolate flavor, making every mouthful a burst of deliciousness. Plus, these brownies are incredibly easy to whip up, which makes them a go-to recipe for both novice and experienced bakers alike.
Ingredient List
- 1 (18-oz) package brownie mix
- Additional ingredients to prepare cake-like brownies (typically water, eggs, and oil as per package instructions)
- 1 (7-oz) jar marshmallow crème
- 1 cup creamy peanut butter
- 1 (12-oz) package semi-sweet chocolate chips
- 4 cups Rice Krispie cereal
Kitchen Gear Checklist
- Mixing bowls: For combining the brownie mix and other ingredients.
- 9×13 inch baking pan: To bake the brownies in.
- Spatula: For spreading the brownie batter and the marshmallow mixture.
- Measuring cups and spoons: To ensure accurate ingredient amounts.
- Microwave-safe bowl: For melting the chocolate and mixing with peanut butter.
Cooking Peanut Butter Krispie Brownies: The Process

Step 1: Preheat Your Oven
Preheat your oven to 350°F (175°C). This ensures that your brownies bake evenly and to the perfect fudgy consistency.
Step 2: Prepare the Brownie Batter
In a large mixing bowl, prepare the brownie mix according to the package instructions. This usually involves adding water, eggs, and oil. Mix until just combined; be careful not to overmix.
Step 3: Bake the Brownies
Pour the brownie batter into a greased 9×13 inch baking pan. Spread it evenly and bake in the preheated oven for about 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
Step 4: Cool the Brownies
Once baked, remove the brownies from the oven and allow them to cool in the pan on a wire rack for about 10-15 minutes.
Step 5: Prepare the Peanut Butter Mixture
In a microwave-safe bowl, combine the creamy peanut butter and the marshmallow crème. Microwave for about 30 seconds, then stir until smooth and well combined.
Step 6: Add Rice Krispies
Gently fold in the Rice Krispie cereal into the peanut butter and marshmallow mixture until evenly coated.
Step 7: Spread the Topping
Once the brownies have cooled slightly, spread the peanut butter Krispie mixture evenly over the top of the brownies.
Step 8: Melt Chocolate Chips
In a clean microwave-safe bowl, melt the semi-sweet chocolate chips in the microwave in 30-second intervals, stirring in between until smooth.
Step 9: Drizzle Chocolate
Drizzle the melted chocolate over the peanut butter Krispie topping. You can use a spatula or a spoon to create a beautiful pattern if desired.
Step 10: Set and Serve
Allow the brownies to set at room temperature for about 30 minutes. For cleaner cuts, you can refrigerate them for an hour before slicing. Cut into squares and serve!
Customize for Your Needs

- For a nut-free option, substitute peanut butter with sunflower seed butter.
- Add chopped nuts, such as walnuts or pecans, for extra crunch.
- Use dark chocolate chips for a richer flavor.
- Mix in some butterscotch chips for a different twist.
Cook’s Commentary
These Peanut Butter Krispie Brownies are not just a dessert; they are a celebration of flavors and textures that can be enjoyed by everyone. The balance of sweetness from the marshmallow crème, the richness of the peanut butter, and the depth of the chocolate makes these brownies irresistible. They are perfect for sharing, but I won’t judge if you keep them all to yourself!
Refrigerate, Freeze, Reheat
If you have leftovers (which is rare!), you can refrigerate the brownies in an airtight container for up to a week. They can also be frozen for up to three months. To reheat, simply thaw them in the refrigerator overnight and enjoy at room temperature, or warm them in the microwave for a few seconds for that fresh-baked taste.
Ask the Chef
Can I use a homemade brownie recipe instead of a mix?
Absolutely! Feel free to use your favorite homemade brownie recipe. Just make sure it’s a dense, fudgy variety to complement the toppings.
What if I don’t have marshmallow crème?
You can make your own by combining 2 cups of mini marshmallows with 2 tablespoons of corn syrup. Melt them together in the microwave, then mix until smooth.
How can I make these brownies more chocolatey?
To amp up the chocolate flavor, consider adding cocoa powder to the brownie mix or using chocolate-flavored Rice Krispies.
Can I make these brownies gluten-free?
Yes! Simply use a gluten-free brownie mix and ensure that the Rice Krispies are certified gluten-free.
Next Up in Your Queue
Bring It to the Table
These Peanut Butter Krispie Brownies are bound to be a hit at any gathering, with their creamy, crunchy, and chocolatey goodness. They are not just a dessert; they are an experience! Serve them warm with a scoop of vanilla ice cream or simply enjoy them as they are. No matter how you choose to serve them, they are sure to impress your friends and family alike.
Indulge in the magic of Peanut Butter Krispie Brownies and watch as they become your new favorite treat!

Peanut Butter Krispie Brownies
Ingredients
Brownie Base
- 1 package brownie mix 18-oz
- additional ingredients to prepare cake-like brownies typically water, eggs, and oil as per package instructions
Topping
- 1 jar marshmallow crème 7-oz
- 1 cup creamy peanut butter
- 1 package semi-sweet chocolate chips 12-oz
- 4 cups Rice Krispie cereal
Instructions
Preparation
- Preheat your oven to 350°F (175°C). This ensures that your brownies bake evenly and to the perfect fudgy consistency.
- In a large mixing bowl, prepare the brownie mix according to the package instructions. This usually involves adding water, eggs, and oil. Mix until just combined; be careful not to overmix.
- Pour the brownie batter into a greased 9x13 inch baking pan. Spread it evenly and bake in the preheated oven for about 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
- Once baked, remove the brownies from the oven and allow them to cool in the pan on a wire rack for about 10-15 minutes.
Topping Preparation
- In a microwave-safe bowl, combine the creamy peanut butter and the marshmallow crème. Microwave for about 30 seconds, then stir until smooth and well combined.
- Gently fold in the Rice Krispie cereal into the peanut butter and marshmallow mixture until evenly coated.
- Once the brownies have cooled slightly, spread the peanut butter Krispie mixture evenly over the top of the brownies.
- In a clean microwave-safe bowl, melt the semi-sweet chocolate chips in the microwave in 30-second intervals, stirring in between until smooth.
- Drizzle the melted chocolate over the peanut butter Krispie topping. You can use a spatula or a spoon to create a beautiful pattern if desired.
- Allow the brownies to set at room temperature for about 30 minutes. For cleaner cuts, you can refrigerate them for an hour before slicing. Cut into squares and serve!
Equipment
- Mixing Bowls
- 9x13 inch baking pan
- Spatula
- Measuring Cups and Spoons
- Microwave-safe bowl
Notes
- For a nut-free option, substitute peanut butter with sunflower seed butter.
- Add chopped nuts, such as walnuts or pecans, for extra crunch.
- Use dark chocolate chips for a richer flavor or mix in butterscotch chips for a twist.
- Refrigerate leftovers in an airtight container for up to a week or freeze for up to three months.
- To make your own marshmallow crème, melt mini marshmallows with corn syrup in the microwave.

