Thick and Fudgy One-Bowl Homemade Chocolate Brownies
Melted chocolate chips and a minimal amount of flour give these thick homemade chocolate brownies a dense, deeply fudgy crumb.

Choosing brown sugar instead of white makes these Thick and Fudgy One-Bowl Homemade Chocolate Brownies particularly damp and chewy. The combination of melted chocolate chips and a very small portion of flour keeps the crumb tightly packed and dense. You can stir the entire batter manually in just one dish, sending it directly into a 350°F (180°C) oven to bake.
The ingredients
You can easily interchange volume and weight measurements to make this batter, with the exception of bakers in Japan who must use weights. Selecting brown sugar over white sugar gives the crumb a damper, chewier bite. We also use a very minimal amount of plain flour to ensure the batter stays barely set, which prevents the squares from drying out.
The chocolate base
A mix of melted chocolate chips and cocoa powder provides the deep chocolate flavor. You need cooking chocolate chips from the baking aisle for the batter base. These chips melt smoothly. Avoid eating chocolate for the melted batter base. Eating chocolate does not melt into a smooth consistency.
You melt the unsalted butter and dark chocolate chips in a heatproof glass bowl. Warm the ingredients in the microwave in short 30-second blasts. Stir the mixture after each burst until the chocolate melts entirely. The recipe uses butter instead of oil to provide a richer taste.
Stir the melted mixture with a spatula until it looks uniform and smooth.
Mixing the batter
Mix the brown sugar and vanilla extract into the smooth chocolate bowl. Add the lightly beaten eggs and mix well. The batter will turn uniform and molten.
Add the plain flour, cocoa powder, and salt. Stir the dry ingredients in just until the batter looks smooth.
You can mix an optional chopped 6 oz (180 g) dark chocolate block or roughly chopped walnuts into the batter. The chocolate chunks create gooey pockets that meld into the crumb during baking. Cooking chocolate bars work best for these add-in chunks. They melt into a smooth texture. You can chop up regular eating chocolate for the chunks. It might not melt as smoothly as the cooking versions.
Baking times
Coat an 8-inch (20 cm) square baking pan with cooking oil spray. Press a sheet of parchment paper into the pan. Let the extra length hang over the sides. The overhanging parchment paper allows you to easily remove the baked slab later.
Pour the mixture into the prepared pan and push it to the corners. Your total time in the oven depends on the texture you prefer. Reduce your chosen baking time by two minutes if you omitted the extra chopped chocolate. Test for doneness by inserting a toothpick into the center of the pan. Hold the toothpick in place for two seconds and pull it out.
- Bake for 24 minutes for a super gooey center. The toothpick will show a significant batter smear.
- Bake for 28 minutes for a dense texture that stays quite damp. The toothpick will show a brown stain and a slight smear.
- Bake for 32 minutes to achieve a moist, cakey texture. The toothpick will emerge clean aside from some loose bits of cake.
Resting and storage
Do not slice the block immediately after baking. The slab needs time to set. Rest the pan undisturbed for 10 minutes. Grab the parchment edges and lift the bake out of the pan. Cool the slab on a wire rack for a minimum of 20 minutes prior to slicing. The squares hold their shape much better after this cooling period.
Bring these brownies to the table on the day they are baked, ideally while the pieces retain a faint touch of heat.
Pack the sliced squares into an airtight container and leave them at room temperature. They keep well up to four days. You only need to refrigerate the pieces if your ambient temperature is very hot. To save the brownies longer, place the sealed container in the freezer where they stay good up to three months.
Thick and Fudgy One-Bowl Homemade Chocolate Brownies
Ingredients
- 3 lightly beaten eggs
- 1.25 cup dark chocolate chips, 7 oz
- 1 cup loosely packed brown sugar
- 0.5 cup plain flour
- 0.25 cup cocoa powder
- 14 tbsp unsalted butter, 1 3/4 sticks
- 1 tsp vanilla extract
- Pinch of salt
- 6 oz dark chocolate block or bar, optional
- 1.5 cup roughly chopped walnuts or other nuts, optional alternative stir-in
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Method
Substitutions
You can chop up regular eating chocolate for the optional add-in chunks, although it may not melt quite as smoothly as dedicated cooking chocolate.
Storage
Store the leftover squares in an airtight container at room temperature for up to four days, and only refrigerate them if your kitchen gets very hot.
Serving
Serve these freshly made Thick and Fudgy One-Bowl Homemade Chocolate Brownies while they are still slightly warm.
Common mistakes
Avoid using regular eating chocolate for the melted batter base because it is not formulated to yield a smooth consistency.
Do not slice the Thick and Fudgy One-Bowl Homemade Chocolate Brownies immediately after baking because the dense center needs at least twenty minutes to cool and set.
Techniques
Test for doneness by inserting a toothpick into the center of the pan and holding it for two seconds before pulling it out to check the crumb.
Look for a significant batter smear on the toothpick for a gooey middle, a slight smear for a fudgy texture, or a clean pick with moist crumbs for a cakey finish.
Sifting your cocoa powder before mixing it into the wet ingredients helps prevent stubborn dry lumps from forming in your batter.
Wipe your knife blade clean with a warm, damp paper towel between each slice to ensure neat and professional-looking squares.
- Store
- Store the leftover squares in an airtight container at room temperature for up to four days, and only refrigerate them if your kitchen gets very hot.
Can I substitute white sugar for the brown sugar?
You can, but it will change the final texture of your Thick and Fudgy One-Bowl Homemade Chocolate Brownies. The recipe relies on brown sugar to provide extra moisture and a much chewier crumb than white sugar can offer.
Is it okay to swap the butter for baking oil?
It is best to stick with the 14 tablespoons (200 g) of unsalted butter called for in the ingredients. Butter is specifically chosen over oil for this batter to give the baked squares a much richer taste.
Why do I need to hold the toothpick in the brownie for two seconds when checking for doneness?
Pausing for two full seconds allows the dense, molten batter to actually grip the wood. When you pull it out, you will get an accurate read on whether the center has reached your preferred level of a gooey smear or a cakey crumb.
Why did my brownies turn out dry instead of moist and fudgy?
You likely left the pan in the oven for too long. If you chose to skip the optional 6 ounces (180 g) of chopped dark chocolate chunks, you must remember to decrease your total baking time by two minutes to prevent the minimal amount of flour from drying out the crumb.
What is the best way to freeze the baked squares?
Wrap each completely cooled square tightly in plastic wrap, then place them all into a heavy-duty freezer bag or airtight container. This double layer of protection prevents freezer burn and keeps the texture intact for up to three months.
Can I bake this batter in a glass dish instead of a metal pan?
Yes, but glass takes longer to heat up and holds onto heat much longer than metal does. If you must use a glass pan, it is generally recommended to lower the oven temperature by 25 degrees Fahrenheit to prevent the edges from overbaking while the center sets.
What is the best way to serve these warm?
A classic pairing for warm, gooey chocolate bakes is a large scoop of vanilla bean ice cream right on top. The cold ice cream melts beautifully into the hot crust, creating a perfect contrast of temperatures and textures.
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