These flourless chocolate brownies are the kind of dessert that solves a problem and creates delight at the same time. They are dense, fudgy, and shockingly simple to pull together — butter, chocolate, sugar, eggs, a little cocoa and cornstarch. No flour means a more intense chocolate experience and a texture that sits somewhere between a brownie and a chocolate tart.

I make these when I want a fast, crowd-pleasing dessert that doesn’t require sifting or folding in flour. They come together in one bowl, bake in a single pan, and cut into glossy, slightly crackled squares that keep well for several days. If you like a rich centre with tender edges, these will be your new go-to.

Below you’ll find the exact ingredients and a straightforward method that I use every time, plus tips on swaps, what to avoid, and how to make them lighter if you prefer. No fluff — just clear steps and practical advice so you can get them in the oven and on the table.

What’s in the Bowl

Ingredients

1/3 cup melted butter — provides fat for richness and glossy texture.
8 ounces semi sweet baker’s chocolate, chopped — the chocolate backbone; use a good-quality baker’s chocolate for deepest flavor.
¾ cup granulated sugar — sweetens and helps create the crackled top.
1/4 teaspoon salt — balances sweetness and enhances chocolate flavor.
1 teaspoon vanilla — rounds and lifts the chocolate notes.
2 large eggs, beaten — give structure and the fudgy crumb; add them one at a time.
3 tablespoons dark cocoa powder — intensifies chocolate without adding flour; use Dutch-process if you prefer a rounder taste.
2 tablespoons cornstarch — the thickener that replaces flour and gives the brownies body.
1/4 cup chocolate chips or chocolate chunks — optional topping for extra melt pockets and a pretty finish.

Make Flourless Chocolate Brownies: A Simple Method

Preheat the oven to 350°F. Line an 8×8-inch baking pan with parchment paper and lightly spray the parchment and pan; set aside.
Place the 1/3 cup melted butter and the 8 ounces chopped semi‑sweet baker’s chocolate in a microwave‑safe bowl. Microwave in 30‑second intervals, stirring well between intervals, until the chocolate and butter are fully melted and smooth.
Let the chocolate mixture cool slightly (about 1–2 minutes) so it is warm but not hot.
Whisk the ¾ cup granulated sugar, 1 teaspoon vanilla, and 1/4 teaspoon salt into the warm chocolate mixture until combined.
Add the 2 beaten large eggs one at a time, whisking after each addition until just combined.
Add the 3 tablespoons dark cocoa powder and 2 tablespoons cornstarch. Whisk or fold until the batter is smooth and no lumps remain.
Pour the batter into the prepared pan and smooth the top with a spatula. Sprinkle the 1/4 cup chocolate chips or chocolate chunks evenly over the top.
Bake for 25–30 minutes, until the center is just set—an inserted toothpick should come out with a few moist crumbs (do not overbake).
Allow the brownies to cool completely in the pan on a wire rack before lifting out on the parchment and slicing.

The Upside of Flourless Chocolate Brownies

There are a few obvious perks to this version. First, they’re intense. Without flour diluting the batter, you get concentrated chocolate in every bite. Second, the texture is reliably fudgy: the cornstarch stabilizes the eggs and creates a custard-like interior. Third, the recipe is naturally quick and forgiving. You melt, whisk, bake, and you’re done.

They’re also a great option for guests who avoid gluten — while not certified gluten-free by default, there’s no wheat flour in the list. And since the method relies on whole eggs and melted chocolate, you don’t need special techniques like whipping egg whites or tempering anything. That makes it easy to teach or to scale up for a small crowd.

Budget & Availability Swaps

Good baker’s chocolate yields the best results, but you can adapt if you’re shopping on a budget or constrained by what’s available.

Chocolate: If you can’t find semi-sweet baker’s chocolate, use an equal weight of a chopped dark chocolate bar (around 60–70% cacao). Avoid milk chocolate — it changes sweetness and structure.
Butter: If butter is tight in your budget, don’t substitute oils here; butter contributes flavor and the right mouthfeel. If needed, reduce the quantity slightly and use a neutral-flavored stick butter or a mix of butter and a small amount of vegetable shortening, but expect a subtle flavor difference.
Cocoa powder: Dutch-process will give a rounder, less acidic flavor. Natural cocoa works too; flavor will be brighter. Use what you have on hand.
Chocolate chips/chunks: Skip them if you don’t have them; the brownies are deeply chocolatey without the topping. Alternatively, sprinkle chopped nuts or a pinch of flaky salt for contrast.

Hardware & Gadgets

No fancy tools are necessary. This is one-bowl baking in spirit but uses a microwave-safe bowl in the method. Here’s what helps:

8×8-inch baking pan: Gives the correct depth for that fudgy center. An 9×9 will make them slightly thinner and faster to bake.
Parchment paper: Line the pan for easy removal and clean slicing.
Microwave or double boiler: The recipe specifies a microwave, which is fast. If you prefer, melt chocolate and butter over low heat in a double boiler, stirring constantly.
Whisk and spatula: A whisk gets the sugar and eggs incorporated smoothly; a spatula helps spread the batter and scrape the bowl.
Wire rack: Cool the pan on a wire rack to avoid residual heat continuing to cook the brownies unevenly.

Mistakes Even Pros Make

Even experienced bakers can trip up on these. Here are the pitfalls I see most often and how to avoid them.

1. Overheating the chocolate

Chocolate scorches easily. If you microwave without stirring at 30-second intervals or let the bowl sit on hot plate heat, the chocolate can seize. Stir frequently and stop microwaving once it’s almost melted; residual heat will finish it.

2. Adding hot chocolate to eggs

If the chocolate is too hot when you add sugar and eggs, the eggs can curdle into scrambled bits. Let the melted mixture cool for a minute or two until warm, not hot, before whisking in sugar and eggs.

3. Overbaking

This batter is forgiving up to a point. Overbaking dries the brownies and robs them of their fudgy character. Start checking at 25 minutes; a toothpick with a few moist crumbs is perfect.

4. Skipping the parchment

Without parchment, edges can stick and the brownie can break when you remove it. Line and lightly spray the parchment for a clean lift-out.

How to Make It Lighter

If you want a less dense bar, here are practical ways to nudge the texture without wrecking the recipe.

Reduce baking time slightly and remove when very slightly underdone — cooling will finish the set and keep the center tender.
Use a slightly lighter chocolate (for example, lower cacao percentage) and increase cocoa powder by a teaspoon to maintain chocolate flavor; this can soften the richness.
Whisk the eggs a little more before adding them to incorporate a touch of air. Don’t overdo it — you want some lift but not a cakey crumb.

Flavor Logic

Everything in this recipe plays a clear role. Butter and chocolate provide fat and flavor. Sugar creates structure at the surface (hello, crackly top) and balances bitterness. Eggs set the interior and provide richness. Cocoa deepens the chocolate profile without adding bulk. Cornstarch stands in for flour to stabilize and thicken without changing the flourless identity.

If you add salt and vanilla, they don’t change the structure, but they transform the way the chocolate reads on the palate — salt sharpens, vanilla rounds. The little sprinkle of chips or chunks on top adds textural contrast and those molten pockets that are irresistible when the brownies are slightly warm.

Storing, Freezing & Reheating

These brownies store well because they’re dense and moist. For the best texture:

Room temperature: Keep in an airtight container for up to 3 days. Place a sheet of parchment between layers if you stack them.
Refrigeration: You can refrigerate for up to a week; bring to room temperature before serving for the best texture and flavor.
Freezing: Wrap individual squares tightly in plastic and then foil, or freeze the whole slab wrapped well. Frozen brownies keep for up to 3 months. Thaw in the refrigerator or at room temperature.
Reheating: For a just-warm serving, microwave a single square for 8–12 seconds or warm in a low oven (300°F) for 5–8 minutes. Avoid overheating, which will dry them out.

Reader Questions

Q: Can I make these dairy-free? A: The recipe relies on butter for texture and flavor, so subbing a neutral oil will change the mouthfeel. If you need dairy-free, try a high-quality dairy-free butter alternative with a flavour profile similar to butter, but results will vary.

Q: Do I have to use cornstarch? A: Cornstarch is the flour substitute that gives structure. Arrowroot can work as a 1:1 swap, but other starches will affect texture. Omit it and the brownies will be looser and may not set properly.

Q: Can I scale the recipe up? A: Yes. To double, use a 9×13 pan and adjust baking time, checking for doneness starting at the shorter end of the time estimate. Keep an eye on edges vs. center.

Before You Go

These flourless chocolate brownies are one of those recipes that rewards attention to a few details: don’t overheat the chocolate, cool it slightly before adding eggs, and don’t overbake. Follow the steps, and you’ll have glossy, fudgy brownies with a crackly top and a deeply chocolate centre.

Make them for a weeknight dessert or a small gathering. Serve slightly warm with a spoonful of crème fraîche or a scoop of vanilla ice cream if you like contrast. Most importantly: enjoy the simplicity. Great dessert doesn’t have to be complicated.