There’s something truly magical about a pan of warm brownies fresh from the oven. The aroma wafting through your kitchen, the anticipation as you cut into the soft, fudgy squares, and the first bite that melts in your mouth—it’s a classic dessert that never goes out of style. Today, I’m excited to share with you the recipe for Cook’s Illustrated Chewy Brownies, a delightful treat that showcases rich chocolate flavors and a perfect chewy texture.
These brownies are everything you want in a chocolate dessert: dense, rich, and utterly satisfying. Using unsweetened cocoa powder and semi-sweet chocolate chunks gives them that deep chocolate flavor we crave. While they are perfect for any occasion, these brownies are particularly great to whip up when you need a quick dessert or a sweet treat to share.
What Makes This Recipe Special

Cook’s Illustrated is known for its meticulously tested recipes, and this chewy brownie recipe is no exception. The combination of cocoa powder and chopped unsweetened chocolate ensures a robust chocolate flavor, while the addition of both whole eggs and egg yolks contributes to that irresistible chewy texture. Using boiling water not only dissolves the cocoa powder but also helps to bloom the chocolate flavor, resulting in brownies that are deeply satisfying with every bite.
Ingredient Rundown
To embark on your brownie-making journey, gather the following ingredients:
- 1 cup unsweetened cocoa powder – The base of our rich chocolate flavor.
- 2 tablespoons boiling water – To bloom the cocoa powder and enhance its flavor.
- 2 oz. unsweetened chocolate, chopped – Adds depth and richness.
- 1 stick unsalted butter, melted – Provides moisture and richness.
- 2 tablespoons vegetable oil – Enhances the chewiness.
- 2 large eggs – For binding.
- 2 large egg yolks – Adds richness and moisture.
- 2 teaspoons vanilla extract – For flavor depth.
- 2 cups granulated sugar – Sweetness and helps with texture.
- 1 cup flour – For structure.
- 1 teaspoon salt – Balances the sweetness.
- 4 oz. semi-sweet chocolate chunks – For added chocolate goodness.
Setup & Equipment
Before diving into the baking process, make sure you have the following equipment ready:
- 8×8 inch baking pan – The perfect size for these chewy brownies.
- Parchment paper – To line the baking pan for easy removal.
- Mixing bowls – For combining ingredients.
- Whisk – To mix the ingredients smoothly.
- Rubber spatula – For folding in the chocolate chunks.
- Measuring cups and spoons – For accurate ingredient measurement.
Mastering Cook’s Illustrated Chewy Brownies: How-To

Now that you’re all set up, let’s dive into the step-by-step process of making these delicious brownies.
Step 1: Preheat the Oven
Preheat your oven to 350°F (175°C). This ensures that your brownies bake evenly and thoroughly.
Step 2: Prepare the Baking Pan
Line an 8×8 inch baking pan with parchment paper, leaving some overhang on the sides. This will make it easier to lift the brownies out once they’re baked.
Step 3: Bloom the Cocoa Powder
In a medium bowl, whisk together the unsweetened cocoa powder and boiling water until smooth. This step is crucial as it intensifies the cocoa flavor.
Step 4: Melt the Chocolate
In a separate bowl, combine the chopped unsweetened chocolate and melted butter. Stir until the chocolate is completely melted and the mixture is smooth.
Step 5: Combine Wet Ingredients
To the melted chocolate mixture, add the vegetable oil, eggs, egg yolks, vanilla extract, and granulated sugar. Whisk until everything is well combined and smooth.
Step 6: Mix in Cocoa
Add the cocoa mixture to the wet ingredients and whisk until combined. The batter will be thick and glossy.
Step 7: Incorporate Dry Ingredients
Gently fold in the flour and salt using a rubber spatula until just combined. Be careful not to overmix, as this can lead to tough brownies.
Step 8: Add Chocolate Chunks
Fold in the semi-sweet chocolate chunks until evenly distributed throughout the batter.
Step 9: Bake
Pour the brownie batter into the prepared baking pan and spread it into an even layer. Bake in the preheated oven for about 25-30 minutes, or until a toothpick inserted in the center comes out with a few moist crumbs.
Step 10: Cool and Cut
Allow the brownies to cool in the pan for about 10-15 minutes, then use the parchment overhang to lift them out onto a wire rack to cool completely before cutting into squares.
Holiday & Seasonal Touches

These brownies are versatile and can be dressed up for any occasion. Consider these ideas:
- Mint Chocolate Swirl: Add a few drops of peppermint extract to the batter for a festive twist.
- Nutty Crunch: Fold in chopped walnuts or pecans for added texture.
- Caramel Drizzle: Drizzle warm caramel sauce over the top before serving.
- Holiday Sprinkles: Top with colorful sprinkles for a fun celebration touch.
Missteps & Fixes
Even the best bakers can encounter challenges. Here are some common missteps and how to fix them:
- Brownies are too dry: Make sure to avoid overbaking. Remember, they continue to cook slightly after being removed from the oven.
- Brownies are too gooey: If your toothpick comes out with wet batter, return them to the oven for another 5-10 minutes.
- Uneven baking: Ensure your oven is properly calibrated and rotate the pan halfway through baking.
Leftovers & Meal Prep
Brownies can be stored and enjoyed long after they’re baked:
Once cooled, store the brownies in an airtight container at room temperature for up to 5 days. For longer storage, you can freeze them. Wrap each brownie in plastic wrap, place them in a freezer bag, and freeze for up to 3 months. Simply thaw at room temperature before enjoying.
Quick Q&A
Can I use different types of chocolate?
Yes! You can substitute the semi-sweet chocolate chunks with milk chocolate or dark chocolate, depending on your preference.
Is there a way to make these brownies gluten-free?
Absolutely! Swap the all-purpose flour with a gluten-free flour blend for a delicious gluten-free version.
Can I add other flavors to the brownies?
Definitely! You can experiment with flavors such as espresso powder, orange zest, or coconut extract to create your unique twist.
What should I serve with brownies?
These brownies are delightful on their own but pair wonderfully with a scoop of vanilla ice cream, whipped cream, or a drizzle of chocolate sauce.
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As you indulge in these rich, chewy brownies, remember that baking is not just about the end result; it’s about the process, the love, and the joy it brings. So gather your ingredients, preheat that oven, and get ready to create a batch of Cook’s Illustrated Chewy Brownies that will leave everyone asking for seconds!

Cook's Illustrated Chewy Brownies
Ingredients
- 1 cup unsweetened cocoa powder the base of our rich chocolate flavor
- 2 tablespoons boiling water to bloom the cocoa powder
- 2 oz. unsweetened chocolate, chopped adds depth and richness
- 1 stick unsalted butter, melted provides moisture and richness
- 2 tablespoons vegetable oil enhances the chewiness
- 2 large eggs for binding
- 2 large egg yolks adds richness and moisture
- 2 teaspoons vanilla extract for flavor depth
- 2 cups granulated sugar sweetness and helps with texture
- 1 cup flour for structure
- 1 teaspoon salt balances the sweetness
- 4 oz. semi-sweet chocolate chunks for added chocolate goodness
Instructions
- Preheat your oven to 350°F (175°C).
- Line an 8x8 inch baking pan with parchment paper, leaving some overhang on the sides.
- In a medium bowl, whisk together the unsweetened cocoa powder and boiling water until smooth.
- In a separate bowl, combine the chopped unsweetened chocolate and melted butter. Stir until the chocolate is completely melted and the mixture is smooth.
- To the melted chocolate mixture, add the vegetable oil, eggs, egg yolks, vanilla extract, and granulated sugar. Whisk until well combined and smooth.
- Add the cocoa mixture to the wet ingredients and whisk until combined.
- Gently fold in the flour and salt using a rubber spatula until just combined.
- Fold in the semi-sweet chocolate chunks until evenly distributed throughout the batter.
- Pour the brownie batter into the prepared baking pan and spread it into an even layer. Bake for about 25-30 minutes.
- Allow the brownies to cool in the pan for about 10-15 minutes, then lift them out onto a wire rack to cool completely before cutting into squares.
Equipment
- 8x8 inch baking pan
- Parchment Paper
- Mixing bowls
- Whisk
- Rubber spatula
- Measuring cups and spoons
Notes
- Store brownies in an airtight container at room temperature for up to 5 days.
- For longer storage, wrap each brownie in plastic wrap and freeze for up to 3 months.
- Experiment with different types of chocolate for unique flavors.
