If you love rich chocolate desserts with a nostalgic twist, these Fluffernutter Brownies are about to become your new favorite treat. With a fudgy chocolate base swirled with creamy peanut butter and gooey marshmallow fluff, this recipe delivers big flavor with simple pantry ingredients. Perfect for bake sales, family gatherings, or an easy weeknight dessert, these brownies are as fun to make as they are to eat.
❤️ Why You’ll Love These Fluffernutter Brownies
- Rich and fudgy texture with just the right chew
- Classic fluffernutter flavor kids and adults adore
- Easy, one-bowl recipe with simple ingredients
- Perfect for sharing at parties, holidays, or school events
- Customizable with family-safe substitutions
These brownies combine the comfort of a childhood sandwich with the indulgence of a bakery-style dessert — without complicated steps.
🧾 Ingredients You’ll Need
- 2 large eggs
- ½ cup unsalted butter
- 6 oz semi-sweet chocolate
- ¾ cup granulated sugar
- ¼ cup brown sugar
- 2 tbsp unsweetened cocoa powder
- ½ cup all-purpose flour
- ¼ tsp salt
- 1 tsp vanilla extract
- ⅓ cup creamy peanut butter
- ⅓ cup marshmallow fluff
- ¼ cup mini chocolate chips
👩🍳 How to Make Fluffernutter Brownies (Step-by-Step)
Step 1: Melt the Chocolate
In a microwave-safe bowl or saucepan, melt the butter and semi-sweet chocolate together until smooth. Stir well and allow to cool slightly.
Step 2: Mix the Base
Whisk in granulated sugar, brown sugar, cocoa powder, vanilla extract, and salt until fully combined. Add the eggs one at a time, mixing until the batter looks glossy.
Step 3: Add Dry Ingredients
Gently fold in the flour just until incorporated. Stir in the mini chocolate chips for extra richness.
Step 4: Assemble
Spread the brownie batter evenly into a lined baking pan. Drop spoonfuls of peanut butter and marshmallow fluff over the top.
Step 5: Swirl & Bake
Use a knife to gently swirl the toppings into the batter. Bake until the edges are set and the center is slightly soft for that perfect fudgy texture.
Step 6: Cool & Slice
Let the brownies cool completely before slicing to allow the swirls to set beautifully.
💡 Tips & Variations
- Extra gooey: Add mini marshmallows on top during the last 5 minutes of baking
- Nut-free: Swap peanut butter for sunflower seed butter
- Richer flavor: Use dark chocolate instead of semi-sweet
- Cleaner cuts: Chill brownies briefly before slicing
🍽️ Serving Ideas & Storage
Serve these brownies slightly warm with a glass of milk or topped with vanilla ice cream for a crowd-pleasing dessert. Store leftovers in an airtight container at room temperature for up to 3 days, or refrigerate for up to 5 days.
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🍫 Fluffernutter Brownies
- Total Time: 47
- Yield: 16 brownies 1x
- Diet: Vegetarian
Description
Craving a decadent, easy dessert that combines rich chocolate, gooey marshmallow fluff, and creamy peanut butter? These Fluffernutter Brownies bake up thick, chewy, and fudgy, with nostalgic swirls inspired by the classic fluffernutter sandwich. Perfect for bake sales, holidays, and anytime you want an irresistible crowd-pleaser.
Ingredients
1/2 cup (113g) unsalted butter
6 oz (170g) semi-sweet chocolate, chopped (or chips)
3/4 cup (150g) granulated sugar
1/4 cup (50g) brown sugar, packed
2 tbsp (10g) unsweetened cocoa powder
1 tsp vanilla extract
1/4 tsp salt
2 large eggs
1/2 cup (65g) all-purpose flour
1/4 cup (45g) mini chocolate chips
1/3 cup (85g) creamy peanut butter
1/3 cup (80g) marshmallow fluff
Instructions
1. Preheat oven to 350°F (175°C). Line an 8×8-inch (20×20 cm) pan with parchment, leaving overhang for lifting.
2. Melt butter and semi-sweet chocolate together until smooth (microwave in short bursts or use a saucepan). Cool 2–3 minutes.
3. Whisk in granulated sugar, brown sugar, cocoa powder, vanilla, and salt until combined.
4. Add eggs one at a time, whisking well after each, until the batter looks glossy.
5. Fold in flour just until no streaks remain. Stir in mini chocolate chips.
6. Spread batter evenly into the prepared pan.
7. Dollop peanut butter and marshmallow fluff over the batter in spoonfuls.
8. Use a butter knife to gently swirl the peanut butter and fluff into the top (don’t overmix—leave visible ribbons).
9. Bake 28–35 minutes, until edges are set and the center has a few moist crumbs (not wet batter).
10. Cool completely (at least 1 hour) before slicing for clean swirls and fudgy texture.
Notes
For extra-gooey brownies, slightly warm the peanut butter for 10–15 seconds so it dollops easily.
Don’t overbake—pull them when the center is just set for a fudgier bite.
For nut-free, swap peanut butter with sunflower seed butter (taste will change slightly).
Mini marshmallows can replace fluff: sprinkle 1 cup on top in the last 5 minutes of baking.
Storage: Keep airtight at room temp 3 days or refrigerate up to 5 days. Slice after chilling for the cleanest cuts.
- Prep Time: 15
- Cook Time: 32
- Category: Dessert
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 brownie
- Calories: 280
- Sugar: 22
- Sodium: 120
- Fat: 15
- Saturated Fat: 7
- Unsaturated Fat: 7
- Trans Fat: 0
- Carbohydrates: 34
- Fiber: 2
- Protein: 5
- Cholesterol: 55
📊 Nutrition Facts (Per Serving)
| Calories | Protein | Carbs | Fat | Fiber | Sodium |
|---|---|---|---|---|---|
| ~280 | 5g | 34g | 15g | 2g | 120mg |
(Values are approximate.)
✨ Final Thoughts
These Fluffernutter Brownies strike the perfect balance between nostalgic comfort and rich chocolate indulgence. Easy enough for beginners and impressive enough for guests, they’re guaranteed to disappear fast — so you might want to make a double batch!