Indulge in pure bliss with my Gooey Peanut Butter Marshmallow Brownies! These brownies combine rich chocolate and creamy peanut butter, topped with sweet, fluffy marshmallows. You'll love every gooey bite. Perfect for gatherings or a cozy night in, they are easy to make and sure to impress. Ready to satisfy your sweet tooth? Dive into this simple recipe and discover the magic behind these delicious treats!
Why I Love This Recipe
- Decadent Flavor: The combination of rich chocolate, creamy peanut butter, and gooey marshmallows creates a dessert that is incredibly indulgent and satisfying.
- Easy to Make: This recipe is straightforward with simple steps, making it perfect for both novice and experienced bakers alike.
- Versatile Treat: These brownies can be served warm or cooled, and they pair perfectly with ice cream or a drizzle of chocolate sauce.
- Fun Presentation: With their layered look and optional toppings like chopped peanuts, these brownies are visually appealing and great for sharing at gatherings.
Ingredients
List of Ingredients
- 1 cup unsalted butter (2 sticks)
- 1 cup semi-sweet chocolate chips
- 1 ½ cups granulated sugar
- 1 teaspoon vanilla extract
- 4 large eggs
- 1 cup all-purpose flour
- ½ cup cocoa powder
- ½ teaspoon salt
- 1 cup creamy peanut butter
- 2 cups mini marshmallows
- ½ cup chopped peanuts (optional)
These ingredients create a blissful dessert. The unsalted butter gives a rich base. Chocolate chips add sweetness and depth. Granulated sugar balances the flavors well. Vanilla extract brings warmth to the mix. Eggs help bind everything together.
All-purpose flour and cocoa powder give structure and chocolatey goodness. The salt enhances all the flavors. Creamy peanut butter adds richness and that nutty taste. Mini marshmallows melt into gooey pockets. Chopped peanuts can give a nice crunch, but they are optional.
Gather these ingredients before you start. Each one plays a key role in your gooey dessert. Enjoy the process of blending these tasty items into something special!

Step-by-Step Instructions
Preheat the Oven and Prepare the Pan
Preheat your oven to 350°F (175°C). Grease a 9x13-inch pan lightly. Then, line the bottom and sides with parchment paper. This helps with easy removal later.
Melt the Base Ingredients
In a medium saucepan, combine 1 cup of unsalted butter and 1 cup of semi-sweet chocolate chips. Set the heat to medium. Stir until the mix melts and is smooth. Remove the saucepan from the heat and let it cool for about 5 minutes.
Mix in Sugars and Eggs
Add 1 ½ cups of granulated sugar and 1 teaspoon of vanilla extract to the melted mix. Whisk until everything blends well. Now, add 4 large eggs one at a time. Mix well after each egg. This step helps create a glossy brownie batter.
Combine Dry Ingredients with Wet Ingredients
In a separate bowl, sift together 1 cup of all-purpose flour, ½ cup of cocoa powder, and ½ teaspoon of salt. Gradually fold this mix into your wet ingredients. Use a spatula and be gentle. You want to mix until there is no dry flour left.
Layer the Batter and Add Peanut Butter Marshmallow Mix
Pour half of the brownie batter into your prepared pan. Spread it evenly across the bottom. In another bowl, mix 1 cup of creamy peanut butter and 2 cups of mini marshmallows. Spread this mixture over the first layer of brownie batter.
Bake and Cool the Brownies
Now, pour the remaining brownie batter on top of the peanut butter and marshmallow layer. Smooth it out evenly. If you want, sprinkle ½ cup of chopped peanuts on top. Place the pan in the oven and bake for 25-30 minutes. Check with a toothpick; it should come out with a few moist crumbs. Let the brownies cool in the pan for at least 20 minutes before lifting them out. Cut into squares and enjoy the gooey goodness!
Tips & Tricks
Achieving the Perfect Gooey Texture
To get that perfect gooey texture, watch your baking time closely. I suggest checking the brownies around 25 minutes. Insert a toothpick into the center. If it comes out with a few moist crumbs, they are done. If it looks dry, they may be overbaked. Always let them cool before cutting. This helps the gooeyness settle.
Substitutions for Ingredients
You can swap some ingredients based on your taste. If you want a nutty flavor, use crunchy peanut butter. For a richer taste, dark chocolate chips work well too. You can also replace granulated sugar with brown sugar for a deeper flavor. If you're out of mini marshmallows, regular ones can work, just chop them before mixing.
Baking Time and Temperature Tips
Always preheat your oven to 350°F (175°C). This step is key for even baking. If you live at a high altitude, you may need to bake a bit longer. Keep an eye on the brownies; ovens can vary. I recommend using an oven thermometer to ensure accuracy. This simple tool can help you avoid undercooked or burnt brownies.
Pro Tips
- Use Quality Chocolate: The better the chocolate, the richer the flavor of your brownies. Opt for high-quality semi-sweet chocolate chips for the best results.
- Don’t Overbake: To keep your brownies gooey, avoid overbaking. Check them at the 25-minute mark; they should still be soft in the center.
- Let Them Cool: Allow the brownies to cool in the pan before cutting. This will help them set up properly and make for cleaner, more appealing squares.
- Experiment with Mix-Ins: Feel free to customize your brownies by adding other mix-ins, such as chocolate chunks, caramel swirls, or different nuts for added texture and flavor.
Variations
Different Nut Options
You can switch up the nuts in this recipe. Instead of chopped peanuts, try walnuts or pecans. Both add a nice crunch and flavor. If you want a different taste, use almonds or hazelnuts. Just chop them up and mix them in. You can even toast the nuts for extra depth. This small change can make your brownies unique.
Adding Flavor with Extracts
Want to boost the flavor? Use other extracts. Almond extract adds a nice twist. Peppermint extract can give your brownies a fun, festive taste. Just a teaspoon of either can change the whole treat. Mix it in with the vanilla extract when you combine the sugars.
Swapping Marshmallows for Other Mix-ins
If you want to try something new, swap the mini marshmallows. You can use chocolate chunks, caramel bits, or even dried fruit. Each option will give a new twist to your brownies. Just keep the same amount as the marshmallows. This way, your gooey dessert remains rich and delightful.
Storage Info
How to Store Brownies
To keep your brownies fresh, place them in an airtight container. You can store them at room temperature for up to three days. For longer storage, keep them in the fridge. Just remember to let them cool completely before covering them. This helps keep that gooey texture intact.
Freezing Instructions
If you want to make your brownies last longer, freezing is a great option. Cut the brownies into squares first. Wrap each square in plastic wrap, then place them in a freezer-safe bag. These brownies can last up to three months in the freezer. When you're ready to enjoy them, just let them thaw in the fridge overnight.
Best Ways to Reheat
To reheat your brownies, use the microwave for quick results. Place a brownie on a plate and heat it for about 10 to 15 seconds. If you want that fresh-baked feel, you can also use the oven. Preheat the oven to 350°F (175°C) and warm the brownies for 5 to 10 minutes. This way, they stay soft and gooey, just like when you first made them!
FAQs
How to make brownies more fudgy?
To make brownies fudgier, use less flour. You can also add an extra egg. Try using high-quality chocolate. This chocolate will give a richer taste and texture. Consider adding a bit of melted chocolate to the batter. This will enhance the fudginess. Also, avoid overbaking; check them a few minutes early.
Can I use natural peanut butter instead of creamy?
Yes, you can use natural peanut butter. However, it may change the texture. Natural peanut butter is often thicker and can be less sweet. If you like a stronger peanut flavor, use it. You might need to adjust the sugar in your recipe. Creamy peanut butter blends smoother with the marshmallows.
How long do brownies last at room temperature?
Brownies can last about 3 to 4 days at room temperature. Store them in an airtight container. This helps keep them fresh and moist. If you want them to last longer, refrigerate them. Brownies can last up to a week when chilled. Just remember to bring them to room temp before serving.
Can I add chocolate chips to the peanut butter layer?
Absolutely! Adding chocolate chips to the peanut butter layer is a great idea. It adds extra chocolatey goodness. Just fold in about half a cup of chips. This will create a delicious mix of flavors. You’ll enjoy the chewy texture and rich taste even more!
You learned how to make delicious brownies with peanut butter and marshmallows. We covered the key ingredients, step-by-step instructions, and useful tips. Remember to experiment with nuts and other mix-ins for variety. Proper storage ensures your brownies stay fresh, and our FAQs help with common questions. Enjoy baking and sharing these treats! You'll impress everyone with your skills. Happy baking!