Chocolate Marshmallow Bars
Why do desserts that combine chocolate and marshmallow remain timeless favorites, appearing on “most-loved treats” lists year after year? According to a 2023 Google Trends report, searches for “Chocolate Marshmallow Bars” have increased by 40% in the past two years, proving that this nostalgic, gooey treat never goes out of style. If you’ve ever wondered how to make a batch of chocolate marshmallow bars that are as easy as they are irresistible, you’re in the right place. This recipe challenges the belief that stunning, bakery-worthy desserts are complicated—these bars are proof that you can achieve decadent results with simple, pantry-friendly ingredients and minimal fuss.
Ingredients List:
Making Chocolate Marshmallow Bars is delightfully straightforward, requiring just a few kitchen staples:
- Unsalted Butter: 1/2 cup (1 stick), melted
- Brown Sugar: 1 cup, packed
- Granulated Sugar: 1/2 cup
- Large Egg: 1
- Pure Vanilla Extract: 2 teaspoons
- All-Purpose Flour: 1 cup
- Unsweetened Cocoa Powder: 1/3 cup
- Baking Powder: 1/2 teaspoon
- Salt: 1/4 teaspoon
- Mini Marshmallows: 2 cups
- Semisweet Chocolate Chips: 1 cup (milk or dark chocolate chips work well too)
- Graham Crackers: 6 sheets, broken into pieces (optional, for a s’mores twist)
- Chopped Nuts: 1/2 cup (optional; walnuts or pecans add crunch)
Substitution Ideas:
- Use gluten-free all-purpose flour for a gluten-free dessert.
- Swap in vegan butter and a flax egg for a dairy-free, egg-free version.
- Add shredded coconut or peanut butter chips for extra flavor and texture.
The combination of rich chocolate, pillowy marshmallows, and a slightly crisp, chewy base sets these bars apart from any store-bought treat.
Step-by-Step Instructions:
Step 1: Prep the Pan
- Preheat oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper, leaving a slight overhang for easy removal.
Step 2: Mix the Batter
- In a large mixing bowl, whisk together melted butter, brown sugar, and granulated sugar until smooth.
- Add the egg and vanilla extract, mixing until fully incorporated.
- In a separate bowl, sift together the flour, cocoa powder, baking powder, and salt.
- Gradually stir the dry ingredients into the wet mixture until just combined.
Step 3: Layer and Bake
- Spread batter evenly into the prepared pan.
- Sprinkle chocolate chips and half the marshmallows over the top, pressing them in gently.
- Bake for 15 minutes.
Step 4: Add Toppings and Finish Baking
- Remove the pan from the oven. Scatter the remaining marshmallows, graham cracker pieces (if using), and nuts over the partially baked bars.
- Return to oven and bake for an additional 7 minutes, or until marshmallows are puffed and golden.
Step 5: Cool and Slice
- Let bars cool completely in the pan for clean slicing. Use the parchment overhang to lift bars onto a cutting board.
- Cut into squares and enjoy!
Pro Tip: Use a greased knife or dip your knife in hot water for easy, clean slices through the gooey marshmallow topping.

Nutritional Information:
Here’s a snapshot per bar (1/16 of the pan, approximate):
- Calories: 210
- Protein: 2g
- Carbohydrates: 32g
- Fat: 9g
- Sugar: 20g
- Fiber: 1g
- Sodium: 65mg
Nutrition changes with different add-ins or substitutions.
Healthier Alternatives for the Recipe:
- Reduce Sugar: Use ½ cup coconut sugar in place of brown and granulated sugar.
- Whole Wheat Flour: Swap all-purpose for whole wheat pastry flour for added fiber.
- Vegan Version: Use vegan butter, dairy-free chocolate chips, and vegan marshmallows.
- Nut-Free: Simply omit the nuts or use sunflower seeds for crunch.
These tweaks keep Chocolate Marshmallow Bars just as delicious, but better suited for a variety of diets.
Serving Suggestions:
- Dessert Platter: Serve as part of a dessert board with brownies, cookies, and fruit.
- Ice Cream Sundae: Top a warm bar with vanilla ice cream and extra chocolate sauce.
- Lunchbox Treat: Wrap individual bars for a sweet school or work snack.
- Campfire Style: Serve with hot chocolate or coffee for a nostalgic, s’mores-inspired vibe.
For parties, cut bars into bite-sized pieces and skewer with toothpicks for easy serving.
Common Mistakes to Avoid:
- Overbaking: Results in dry bars. Remove when the marshmallows are just puffed and golden.
- Under-mixing: Can cause uneven texture; mix until just combined for even baking.
- Cutting While Warm: Makes for messy slices. Always cool completely before cutting.
- Crowding Marshmallows: Leave some space between marshmallows so they can puff and brown.
Attention to these details ensures perfect, gooey chocolate marshmallow bars every time.
Storing Tips for the Recipe:
- Room Temperature: Store bars in an airtight container for up to 3 days.
- Refrigerate: Keeps bars fresher for up to 1 week (bring to room temp before serving).
- Freeze: Layer bars with parchment in a freezer-safe container for up to 2 months. Thaw at room temp.
These bars are a great make-ahead treat for busy weeks, parties, or holiday gifting.
Conclusion:
Chocolate Marshmallow Bars are a nostalgic, gooey, and crowd-pleasing treat that’s easy to make and even easier to love. With rich chocolate, pillowy marshmallows, and endless customization options, this recipe is sure to become a family favorite. Try it, share your results in the comments, and subscribe for more irresistible dessert ideas!
FAQs:
1. Can I double the recipe for a larger crowd?
Yes—bake in a 9×13-inch pan and add a few minutes to the baking time.
2. Can I use marshmallow fluff instead of marshmallows?
It’s not recommended, as fluff melts differently and won’t brown or puff.
3. How do I keep bars from sticking to the pan?
Always use parchment paper with a bit of overhang for easy lifting and clean cuts.
4. Are these bars freezer-friendly?
Absolutely—freeze slices in a single layer, then transfer to a freezer bag.

Chocolate Marshmallow Bars
Ingredients
- 1/2 cup unsalted butter, melted
- 1 cup brown sugar, packed
- 1/2 cup granulated sugar
- 1 large egg
- 2 tsp pure vanilla extract
- 1 cup all-purpose flour
- 1/3 cup unsweetened cocoa powder
- 1/2 tsp baking powder
- 1/4 tsp salt
- 2 cups mini marshmallows
- 1 cup semisweet chocolate chips (or milk/dark chocolate chips)
- 6 sheets graham crackers, broken (optional for s’mores twist)
- 1/2 cup chopped walnuts or pecans (optional)
Instructions
Prep:
Preheat oven to 350°F (175°C). Line an 8x8-inch baking pan with parchment paper.
Mix Batter:
In a large bowl, whisk together melted butter, brown sugar, and granulated sugar.
Add egg and vanilla, whisk until smooth.
In a separate bowl, sift flour, cocoa powder, baking powder, and salt. Stir into wet ingredients until just combined.
Layer:
Spread batter evenly in pan. Top with half the marshmallows and chocolate chips.
First Bake:
Bake for 15 minutes.
Add Toppings:
Remove pan from oven. Scatter remaining marshmallows, chocolate chips, graham cracker pieces, and nuts on top.
Bake 7 more minutes, until marshmallows are golden.
Cool & Slice:
Cool completely in pan before slicing. Use parchment to lift bars for easy cutting.
Notes
- Use gluten-free flour and vegan marshmallows for dietary needs.
- Store in an airtight container for up to 3 days, or freeze for up to 2 months.