Brownie Recipe With Chocolate Chips and Marshmallows: Gooey Chunks and Crispy Edges

This brownie recipe with chocolate chips and marshmallows delivers the perfect balance of crispy edges and gooey centers you crave. The secret lies in precise measurements and a gentle baking approach that keeps those marshmallows melty and chocolate chips intact.

I developed this after years of burning through batches that either turned cakey or stayed too dense—this version finally gets it right every time.

What sets these brownies apart is the texture contrast: the outside forms a rich, crackly crust while the inside remains fudgy with pockets of warm marshmallow and rich chocolate chunks.

The recipe uses standard pantry ingredients but requires careful attention during the last few minutes of baking to achieve that signature contrast without overcooking.

By the time they come out of the oven, you'll have brownies with glossy, crackly tops that give way to dense, moist centers studded with gooey marshmallow and chocolate chip surprises.

The aroma alone will have everyone gathering in the kitchen, and each bite delivers that perfect combination of textures and flavors.

Perfect for satisfying chocolate cravings or impressing guests, these brownies are especially magical when served warm with vanilla ice cream. The recipe scales easily for parties, and the technique ensures consistent results whether you're making a single pan or doubling the batch. Let's get baking!

Ingredients for brownie recipe with chocolate chips and marshmallows

These rich ingredients transform into decadent brownies with crispy edges and gooey marshmallow pockets.

The butter and sugars are your foundation—European-style butter like Plugrá gives the best flavor, but any high-quality brand works. For the chocolate chips, Enjoy Life brand is my go-to (it's allergy-friendly too), but Ghirardelli or Nestlé work fine. The marshmallows? Standard mini size—jumbo ones won't melt as beautifully. Pro tip: measure your flour by scooping and leveling, not packing it down. The cocoa powder should be Dutch-processed for that velvety texture, and if your pantry version is clumpy, whisk it with a bit of oil before using.

No Dutch-processed cocoa? Natural cocoa powder plus 1 tsp baking soda mimics the effect. Running short on marshmallows? White chocolate chips at half the amount work in a pinch, though they won't be as gooey. The espresso powder is non-negotiable for that deep chocolate flavor—if you don't have it, 1 tsp instant coffee granules will do. For the chocolate chips, Trader Joe's or Costco often have bulk bins at better prices. And if you're feeling fancy, swap half the semi-sweet chips for dark chocolate chunks—they add a sophisticated contrast.

Store your brownies in an airtight container at room temperature for up to 5 days, though they're best enjoyed fresh. For longer storage, wrap individually in parchment and freeze for up to 3 months. The texture changes slightly after freezing, but reheating in a 200°F oven for 5 minutes brings back that glorious fudgy center. These brownies reheat beautifully—just pop a slice in the microwave for 10-15 seconds to soften the marshmallows again. Trust me, the first bite out of the fridge is magical.

Step-by-step instructions for brownie recipe with chocolate chips and marshmallows

Here's how to create the perfect balance of crispy edges and gooey centers—every bite delivers that magical contrast.

In a stand mixer fitted with the paddle attachment, combine the 1 cup unsalted butter (cold and cubed) with the 1.5 cups granulated sugar and 0.5 cup packed brown sugar. Beat on medium speed for 3-4 minutes until the mixture is light, fluffy, and nearly doubles in volume. You'll see the color lighten slightly—this indicates proper aeration for that signature brownie texture.

Here's the thing—don't rush this step. The butter needs to emulsify completely with the sugars to create a smooth batter. If you skip this, you'll end up with dense, cakey brownies instead of the fudgy, crackly-topped ones we're after. Scrape down the sides of the bowl every 30 seconds to ensure even mixing.

Add the 2 whole large eggs one at a time, mixing on low speed for 30 seconds after each addition until fully combined. Then stir in the 1 tsp vanilla extract and 1 tsp instant espresso powder. The espresso powder might seem odd, but it enhances the chocolate flavor without adding bitterness—trust me, it makes a difference.

Next, whisk together the 0.75 cup all-purpose flour, 0.5 cup cocoa powder, 0.5 tsp baking powder, and 0.25 tsp salt in a separate bowl. Sift the dry ingredients directly into the wet mixture and mix on low speed for just 20-30 seconds until combined. Overmixing develops gluten, which can make your brownies tough. You should still see some flour streaks—this ensures the perfect tender crumb.

Remove the bowl from the mixer and gently fold in the 1.5 cups semi-sweet chocolate chips and 2 cups mini marshmallows using a silicone spatula. Be careful not to break up the marshmallows too much—you want those gooey pockets to melt into delicious surprise bites. The chocolate chips should be evenly distributed throughout the batter.

For even better results, I like to press down gently on the batter in the bowl to ensure the chocolate and marshmallows are fully incorporated. This step is crucial for achieving those perfect pockets of molten chocolate and marshmallow goodness in every bite. The batter will be thick and fudgy—exactly what we want.

Preheat your oven to 350°F and line an 8x8-inch baking pan with parchment paper, leaving an overhang on the sides for easy removal. Pour the batter into the prepared pan and smooth the top with a spatula. Here's where precision matters: bake for 25-30 minutes until the edges are deep golden brown and a toothpick inserted in the center comes out with moist crumbs (not wet batter).

This is the moment that matters: the brownies should have crispy edges that contrast beautifully with the still-soft, fudgy center. If your oven runs hot, start checking at the 20-minute mark. The key is to pull them out when they look slightly underdone—they'll continue cooking as they cool. Let them rest in the pan for 10 minutes before transferring to a wire rack to cool completely.

Once the brownies have cooled completely, use a sharp knife or pizza cutter to slice them into squares (about 2x2 inches each). For cleaner cuts, chill the pan in the refrigerator for 10 minutes before slicing. This ensures neat portions and prevents the brownies from falling apart.

Serve immediately while still warm for the ultimate experience—those crispy edges and gooey centers are at their best. Store leftovers in an airtight container at room temperature for up to 3 days, or freeze for up to 3 months. Each bite should deliver that perfect balance of rich chocolate, sweet marshmallow, and crispy texture that makes these brownies irresistible.

Troubleshooting your brownie recipe with chocolate chips and marshmallows

Overbaked Brownies

If your brownies come out dry or cakey, you likely baked them too long or at too high a temperature. The ideal internal temp is 205-210°F—any hotter and the marshmallows will burn before the edges crisp. I’ve found that 350°F for 25-30 minutes works best in most home ovens.

To fix overbaked brownies, slice them into squares and microwave for 5-10 seconds with a damp paper towel over them to restore some moisture. For future batches, use an oven thermometer to verify your oven’s accuracy—many run 25°F hotter than set. 🔥

Marshmallows Too Soft

If your marshmallows turn into a gooey mess instead of staying intact, your oven was likely too hot or the brownies baked too long. The secret is pulling them out when the edges are set but the center still jiggles slightly.

For extra insurance, bake at 325°F for 35-40 minutes—this lower temp helps preserve the marshmallow pockets. If you’ve already baked them, sprinkle the tops with powdered sugar to stabilize the marshmallows and add a nice contrast. 💫

Crackly Top but Dense Inside

This classic brownie fail happens when the outside cooks too fast while the center remains underdone. To fix it, reduce your oven temp to 325°F and tent the pan with aluminum foil after 20 minutes to slow the top’s browning.

For future batches, make sure your butter and eggs are at room temperature—they mix better and create a lighter, more even texture. If you’ve already baked them, slice and serve slightly underdone—they’ll firm up as they cool. 💡

Chocolate Chips Stay Hard

Hard chocolate chips usually mean the oven wasn’t hot enough or the brownies didn’t bake long enough. To prevent this, bake at 350°F for 28-32 minutes and check for doneness with a toothpick—it should come out with moist crumbs, not wet batter.

For extra insurance, fold in 1 tbsp vegetable oil with the chocolate chips before baking—this helps them melt more evenly. If your batch is already baked, pop the pan in the oven for 2-3 minutes at 375°F to melt the chips while keeping the marshmallows intact. ✨

Brownies Stick to Pan

If your brownies refuse to release cleanly from the pan, it’s usually because the parchment paper wasn’t properly lined or the batter wasn’t fully set. Always use parchment paper with a 1-inch overhang on all sides to prevent sticking.