When you think about the perfect brownie, what comes to mind? Soft, fudgy, and with a rich chocolate flavor that practically melts in your mouth? That’s exactly what you get with Cook’s Illustrated Chewy Brownies. This recipe is a chocolate lover’s dream come true, featuring a combination of cocoa powder and unsweetened chocolate that really elevates the flavor profile. With a few simple ingredients and straightforward steps, you can whip up these delightful treats that are sure to impress your friends and family.
What You’ll Love About This Recipe

These brownies are not just your average dessert. Here’s what makes them special:
- Chewy Texture: The perfect balance of chewy and fudgy, these brownies offer a delightful bite.
- Intense Chocolate Flavor: Using both cocoa powder and unsweetened chocolate gives a deep, rich chocolate taste.
- Simple Ingredients: You likely have most of these ingredients in your pantry already!
- Quick to Make: From mixing to baking, you can have these brownies ready in under an hour.
What We’re Using
To create the perfect batch of brownies, gather the following ingredients:
- 1/2 cup unsweetened cocoa powder – This provides the base chocolate flavor.
- 2 tablespoons boiling water – Helps to bloom the cocoa powder for a richer taste.
- 2 oz. unsweetened chocolate, chopped – Adds depth and richness.
- 1/2 cup unsalted butter, melted – For that rich, buttery flavor.
- 2 tablespoons vegetable oil – Enhances the fudginess of the brownies.
- 2 large eggs – Bind the ingredients together.
- 2 large egg yolks – Adds extra richness and moisture.
- 2 teaspoons vanilla extract – A classic flavor enhancer.
- 2 cups granulated sugar – Sweetness to balance the chocolate.
- 1 cup flour – Provides structure to the brownies.
- 1 teaspoon salt – Enhances all the flavors.
- 4 oz. semi-sweet chocolate chunks – For melty chocolate pockets throughout.
Gear Checklist
Before you start baking, make sure you have the right tools:
- Mixing Bowls: For combining your wet and dry ingredients.
- Whisk or Electric Mixer: To beat the eggs and mix everything smoothly.
- Spatula: For folding in the chocolate chunks.
- 9×13 inch Baking Pan: The perfect size for these brownies.
- Parchment Paper: Makes for easy removal and cleanup.
- Measuring Cups and Spoons: For accurate ingredient measurements.
Mastering Cook’s Illustrated Chewy Brownies: How-To

Follow these steps for the ultimate brownie experience:
Step 1: Prepare Your Pan
Preheat your oven to 350°F (175°C). Line a 9×13 inch baking pan with parchment paper, leaving some overhang for easy removal later.
Step 2: Bloom the Cocoa Powder
In a medium bowl, combine the unsweetened cocoa powder and boiling water. Stir well until the mixture is smooth and glossy. Set it aside to cool slightly.
Step 3: Melt the Chocolates
In a separate bowl, melt the chopped unsweetened chocolate in the microwave in 30-second intervals, stirring between each interval until fully melted. Allow it to cool slightly.
Step 4: Combine Wet Ingredients
In a large mixing bowl, whisk together the melted butter, vegetable oil, eggs, egg yolks, and vanilla extract until well combined. Add the cooled cocoa mixture and melted chocolate, mixing until smooth.
Step 5: Mix in the Dry Ingredients
Sprinkle the flour, granulated sugar, and salt over the wet ingredients. Gently fold the dry ingredients into the wet mixture until just combined. Be careful not to overmix!
Step 6: Add the Chocolate Chunks
Fold in the semi-sweet chocolate chunks, ensuring they’re evenly distributed throughout the batter.
Step 7: Bake!
Pour the brownie batter into the prepared pan, spreading it evenly. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.
Step 8: Cool and Serve
Allow the brownies to cool in the pan for about 10 minutes, then use the parchment overhang to lift them out. Let them cool completely on a wire rack before cutting into squares.
Make It Your Way

These brownies are versatile! Here are some ways to customize them:
- Nutty Addition: Add chopped walnuts or pecans for a delightful crunch.
- Minty Flavor: Incorporate peppermint extract for a refreshing twist.
- Spicy Kick: A pinch of cayenne pepper can add an unexpected depth.
- Fruity Touch: Mix in some dried cherries or raspberries for a fruity contrast.
Learn from These Mistakes
Avoid common pitfalls to achieve brownie perfection:
- Don’t overmix the batter – this can lead to tough brownies.
- Make sure to measure your ingredients accurately, especially the flour and cocoa powder.
- Let the brownies cool completely before cutting to achieve clean edges.
- Always check for doneness a few minutes before the timer goes off; ovens can vary.
Meal Prep & Storage Notes
To keep your brownies fresh and delicious:
Store brownies in an airtight container at room temperature for up to 3 days. For longer storage, you can refrigerate them for up to a week or freeze them for up to 3 months. To freeze, wrap each brownie individually in plastic wrap and then place them in a freezer-safe bag. When you’re ready to enjoy them, simply thaw at room temperature or warm them in the microwave for a few seconds.
Reader Q&A
Can I use different types of chocolate in this recipe?
Yes! You can mix and match chocolate types based on your preference. Just keep in mind that the flavor and sweetness level may change slightly.
What if I don’t have unsweetened chocolate?
You can substitute with more cocoa powder and adjust the fat content by adding some extra butter or oil to maintain the recipe’s balance.
Can I make these brownies in advance?
Absolutely! These brownies actually taste better the next day as the flavors meld together. Just store them properly in an airtight container.
What’s the best way to cut brownies?
Use a sharp knife and wipe it clean between cuts for neat squares. Alternatively, you can use a plastic knife, which helps prevent sticking.
Cook This Next
If you love Cook’s Illustrated Chewy Brownies, consider trying these delightful recipes:
Serve & Enjoy
Once your brownies have cooled and are cut into squares, it’s time to dig in! Serve them plain, or dress them up with a scoop of vanilla ice cream, a drizzle of chocolate sauce, or a sprinkle of powdered sugar for an extra touch. These Cook’s Illustrated Chewy Brownies are sure to be a hit at any gathering or simply enjoyed with a glass of milk at home. Happy baking!

Cook's Illustrated Chewy Brownies
Ingredients
- 1/2 cup unsweetened cocoa powder
- 2 tablespoons boiling water
- 2 oz. unsweetened chocolate, chopped
- 1/2 cup unsalted butter, melted
- 2 tablespoons vegetable oil
- 2 large eggs
- 2 large egg yolks
- 2 teaspoons vanilla extract
- 2 cups granulated sugar
- 1 cup flour
- 1 teaspoon salt
- 4 oz. semi-sweet chocolate chunks
Instructions
- Preheat your oven to 350°F (175°C). Line a 9x13 inch baking pan with parchment paper, leaving some overhang for easy removal later.
- In a medium bowl, combine the unsweetened cocoa powder and boiling water. Stir well until the mixture is smooth and glossy. Set it aside to cool slightly.
- In a separate bowl, melt the chopped unsweetened chocolate in the microwave in 30-second intervals, stirring between each interval until fully melted. Allow it to cool slightly.
- In a large mixing bowl, whisk together the melted butter, vegetable oil, eggs, egg yolks, and vanilla extract until well combined. Add the cooled cocoa mixture and melted chocolate, mixing until smooth.
- Sprinkle the flour, granulated sugar, and salt over the wet ingredients. Gently fold the dry ingredients into the wet mixture until just combined. Be careful not to overmix!
- Fold in the semi-sweet chocolate chunks, ensuring they're evenly distributed throughout the batter.
- Pour the brownie batter into the prepared pan, spreading it evenly. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.
- Allow the brownies to cool in the pan for about 10 minutes, then use the parchment overhang to lift them out. Let them cool completely on a wire rack before cutting into squares.
Equipment
- Mixing bowls
- Whisk or electric mixer
- Spatula
- 9x13 inch Baking Pan
- Parchment Paper
- Measuring cups and spoons
Notes
- Store brownies in an airtight container at room temperature for up to 3 days.
- For longer storage, refrigerate them for up to a week or freeze for up to 3 months.
- Wrap each brownie individually in plastic wrap for freezing.
