Most sheet pan brownie recipes disappoint: too thin, too dry, too much like an ordinary chocolate cake. This one was tested fifteen times to avoid exactly those pitfalls. The result is 24 thick, fudgy pieces with that crackly, shiny top that makes all the difference.
The shiny thin crust that forms on top during baking is a sign that the sugars have migrated upward — and that’s what gives this almost lacquered texture, slightly crisp to the tooth before giving way to a nearly moist interior. The edges of the pan cook a little faster and become chewy, almost caramelized. The center remains just set, dense, with a melt-in-your-mouth feel. No fuss, just intense chocolate in every bite.
Why you’ll love this recipe
Ingredient Notes
Baking chocolate, cocoa, butter, oil, two sugars: the combination that makes all the difference.
- Baking chocolate (115 g) : A square of dark chocolate at 60-70% melted with the butter. It provides that straightforward, slightly bitter flavor that cannot be replicated with cocoa alone — the foundation of the entire aromatic structure.
- Butter + oil : Butter gives flavor, oil gives moisture. In such a large pan, butter alone leaves the edges slightly dry. This small addition of oil changes everything without altering the taste.
- White sugar + brown sugar : White sugar is responsible for the shiny, crackly top. Brown sugar adds a slight molasses note and retains moisture in the crumb — a detail that matters greatly over several days.
- 4 whole eggs + 1 yolk : The extra yolk enriches the texture without weighing it down. It is what maintains that almost gooey center even after the brownie has cooled.
- Dutch-processed cocoa powder : Less acidic than natural cocoa, it gives a darker color and a milder, deeper chocolate flavor. The difference is noticeable from the first bite.
Melt the chocolate with the butter
It all starts with melting the chopped chocolate with the butter and oil. Using a double boiler or microwave in 30-second intervals, the goal is a smooth, shiny, homogeneous mixture. Let it cool for a few minutes — you don’t want to add eggs to a hot mixture, as they would instantly curdle and ruin the final texture. That moment when the chocolate slowly melts into the warm butter is a scent all its own, almost cocoa-like and fatty, foreshadowing what’s to come.
Add the eggs without overdoing it
First add the sugars, then the eggs one by one, and finally the extra yolk. Whisk vigorously — not too long, one minute is enough — to dissolve some of the sugar and slightly aerate the mixture. This is the step that determines the shiny top: suspended sugar rises to the surface during baking and forms that characteristic crust. Over-whisking incorporates too much air and makes the result more like cake. Under-whisking leaves the surface matte and dull.
Flour and cocoa, quick and simple
Sift the flour and cocoa together, then fold them in with a spatula using slow, enveloping motions. Stop as soon as no streaks of flour remain. Not a stir more. Overdeveloping gluten turns a fudgy brownie into an elastic, rubbery one. Stir in the chocolate chips at the end. The final batter should be thick, shiny, almost difficult to pour — exactly as it should be.
Baking: decide in advance
Oven at 175°C, preferably with fan/convection. The 23×33 cm pan needs about 32 to 38 minutes. The difference between fudgy and dry often comes down to 5 minutes. The foolproof method: insert a toothpick halfway between the edge and the center — it should come out with a few moist crumbs attached, not clean, not coated in raw batter. The surface should be set and slightly puffed, but it will sink as it cools. That’s normal and intended.
Tips & Tricks
- Do not cut before completely cool. When warm, brownies deform and stick to the knife. One hour at room temperature, or 20 minutes in the refrigerator, gives clean slices with neat edges.
- For perfectly even squares, use a long, smooth knife run under hot water between each cut — it glides without crushing.
- These brownies freeze very well, individually wrapped in plastic. Taken out the day before and left at room temperature, they regain their original texture without reheating.
- Dutch cocoa can be replaced with natural cocoa, but the flavor will be slightly more acidic and the color less deep. Not a dealbreaker, but noticeable.
How do I know when the brownies are done?
Insert a toothpick halfway between the edge and the center of the pan — it should come out with a few moist crumbs, not clean, not coated in liquid batter. The surface should be set and slightly puffed, but it will sink as it cools: that’s normal and intended.
Can I substitute natural cocoa for Dutch-processed cocoa?
Yes, it works, but the result will be slightly more acidic and the color less deep. Dutch-processed cocoa (like Van Houten or Valrhona) is milder on the palate and gives that gentle, intense chocolate flavor we’re aiming for — if you have a choice, go with it.
Why add oil in addition to butter?
In a large pan, butter alone leaves the edges slightly dry after baking. Oil, unlike butter, remains liquid at room temperature and keeps moisture throughout the sheet. The taste remains buttery — the oil is neutral, it only affects texture.
How should I store these brownies to keep them fudgy?
In an airtight container at room temperature, they stay excellent for three days. In the refrigerator, they firm up slightly but return to their texture after 30 minutes at room temperature. Avoid plastic wrap alone, as it sticks to the crackly top and damages it.
Can they be frozen?
Absolutely. Cut the pieces, wrap each individually in plastic wrap, then place them in a freezer bag. They keep for two months. To thaw, leave at room temperature overnight — the texture returns exactly, no reheating needed.
Why an extra egg yolk in addition to the 4 whole eggs?
Yolks add fat and richness without the structure that whites provide. In such a large format, this extra yolk is what keeps the center fudgy and almost gooey once the brownies have cooled, where other large-format recipes become dry and dense.
Ultra-Fudgy Sheet Pan Brownies (23×33 cm Pan)
American
Desserts & Cakes
Thick, dense, intensely chocolatey brownies with that crackly, shiny top everyone tries to replicate. Recipe developed specifically for a 23×33 cm pan — 24 generous servings with chewy edges and a fudgy center that holds up over several days.
Ingredients
- 115 g dark baking chocolate 60-70%, chopped
- 170 g unsalted butter, cut into pieces
- 2 tbsp neutral oil (sunflower or grapeseed)
- 200 g white sugar
- 100 g light brown sugar
- 4 large eggs, at room temperature
- 1 egg yolk
- 1 tsp vanilla extract
- 125 g all-purpose flour
- 85 g Dutch-processed cocoa powder
- ½ tsp fine salt
- 170 g dark chocolate chips
Instructions
- 1Preheat the oven to 175°C with fan (convection). Line a 23×33 cm pan with parchment paper, leaving overhang for easy removal.
- 2In a saucepan over low heat or in a double boiler, melt the chopped chocolate, butter, and oil together, stirring until smooth and shiny. Remove from heat and let cool for 5 minutes.
- 3Add the white and brown sugars to the warm chocolate mixture. Whisk for 1 minute until homogeneous.
- 4Add the eggs one by one, then the extra yolk and vanilla extract. Whisk vigorously for about 1 minute — no more, to avoid incorporating too much air.
- 5Sift the flour, cocoa, and salt together into the bowl. Fold in with a spatula using slow, enveloping motions until no streaks of flour remain.
- 6Add the chocolate chips and stir briefly to distribute. The batter should be thick and shiny.
- 7Pour into the prepared pan and smooth the top with a spatula. Bake for 32 to 38 minutes. Check doneness with a toothpick inserted halfway between the edge and center — it should come out with a few moist crumbs, not clean.
- 8Let cool completely in the pan before cutting, about 1 hour at room temperature or 20 minutes in the refrigerator. Cut into 24 pieces with a smooth knife run under hot water between each cut.
Notes
• Baking chocolate can be semi-sweet or bittersweet according to preference — both work, bittersweet gives a more intense, slightly bitter result.
• Do not open the oven during the first 25 minutes of baking to prevent the brownies from sinking unevenly.
• When checking doneness, always insert the toothpick halfway between the edge and center — the exact center is always the last to bake and will give a too-moist reading.
• Store in an airtight container at room temperature for up to 3 days, or freeze individually for up to 2 months.
Nutrition Facts (per serving, estimated)
| 225 kcalCalories | 3 gProtein | 27 gCarbs | 12 gFat |
