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The Fudgiest Brownies You Need to Make This Week (Marshmallow Swirl, Obviously)

ByKelsey Wheeler

I made these brownies for a playdate last week. Within the hour, the pan was empty. Not almost empty. Gone. Clean. Like they had never existed. I stood there holding the empty dish thinking two things: I should have hidden some for myself, and I need to make these again immediately.

So I did. The very next week I baked a batch for our spring break road trip and let me tell you, baking a treat for the night you arrive to your Airbnb is an underrated tip.

The texture is somewhere between a fudgy brownie and an actual piece of chocolate fudge. Dense, rich, and almost impossibly moist. I swirled in marshmallow fluff before baking, which adds this light, pillowy sweetness and a flavor that genuinely reminds me of sitting around a campfire eating s’mores. If you close your eyes, you can almost smell the smoke.

That said, you can absolutely skip the fluff. Without it, these are still the best fudgy brownie recipe you will ever make. The marshmallow is the bonus, not the foundation.

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Why these brownies hit differently

Most brownie recipes use melted butter and baking chocolate. This one uses cocoa powder, dark chocolate chips, and canola or olive oil. That combination is what creates the ultra-fudgy texture without any of the cakey, dry, disappointing brownie energy that nobody wants. Oil keeps baked goods moist in a way that butter just does not. The dark chocolate chips melt into the batter and create little pockets of intense chocolate throughout. The powdered sugar alongside the granulated sugar gives you that slightly crackly, tissue-thin top that brownie people obsess over.

And then there is the marshmallow fluff swirl. Drop spoonfuls onto the top of the batter before baking and drag a knife or toothpick through to create a swirl pattern. As the brownies bake, the fluff sinks slightly and becomes these sweet, gooey ribbons running through every slice. A little dramatic in the best way.

Easily gluten free

This is one of those recipes where the gluten-free swap is nearly invisible. Because the structure comes from eggs and fat rather than a flour-heavy base, swapping in Bob’s Red Mill 1:1 Gluten Free Baking Flour works seamlessly. The texture stays just as fudgy, just as dense, and nobody at your playdate or potluck will know the difference unless you tell them. I have made both versions and they are genuinely neck and neck.

If you bake for a crowd that includes gluten-free guests, this is one of the easiest wins in your recipe collection. One ingredient swap, same incredible result.

Ingredients

  • 1 cup granulated sugar
  • 3/4 cup all-purpose or GF flour
  • 2/3 cup cocoa powder
  • 1/2 cup powdered sugar
  • 1/2 cup dark chocolate chips
  • 2 large eggs
  • 1/2 cup canola or olive oil
  • 2 tablespoons water
  • 1/2 teaspoon vanilla
  • 3/4 teaspoon sea salt
  • Marshmallow fluff, to swirl

Instructions

  1. Preheat your oven to 325°F. This temperature matters. Lower and slower is what gives you that fudgy center without overbaking the edges. Lightly spray an 8×8 baking dish (not a 9×9, or your brownies will be thinner and overcook) with cooking spray and line with parchment paper, then spray the parchment too.
  2. In a medium bowl, whisk together all your dry ingredients: sugar, flour, cocoa powder, powdered sugar, chocolate chips, and salt.
  3. In a large bowl, whisk the eggs, oil, water, and vanilla until combined.
  4. Fold in the wet and dry ingredients together. Do not overwork it. The batter will be thick, and that is exactly right.
  5. Pour into your prepared pan and smooth the top with a spatula. Drop spoonfuls of marshmallow fluff across the surface and use a knife or toothpick to swirl it through the batter. Bake for 35 to 40 minutes, or until a toothpick comes out with just a few moist crumbs. Pull them early rather than late.
  6. Cool completely before slicing. This is the hardest part, and it is non-negotiable if you want clean squares. Store in an airtight container at room temperature for up to three days.
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Gift idea: brownie mix in a jar

Combine all the dry ingredients (sugar, flour, cocoa powder, powdered sugar, chocolate chips, and salt) and layer them in a mason jar. Tie on a tag with instructions to add 2 eggs, 1/2 cup oil, 2 tablespoons water, and 1/2 teaspoon vanilla, along with temperature and time. It is one of the most thoughtful, affordable, and genuinely useful homemade gifts you can give. Teachers, neighbors, coworkers, hostess gifts. This works for all of them. Make it gluten free with Bob’s Red Mill flour and note it on the tag for an extra thoughtful touch.

Tools & ingredients I used

Enjoy! If you make this recipe, let me know how you like it!

Kelsey

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