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updated 10/23/2012 7:55:06 PM ET 2012-10-23T23:55:06

Did you know it's a mistake to fold in the flour completely when making brownies? Doing so develops gluten, and too much gluten will make your dense and chewy brownies too light and airy when baked. Instead, you should fold brownies until there are just streaks of flour remaining so that you can be positive they aren't overstirred.

Hungry for more scientifically sound culinary know-how? You can find it in the new Cook's Illustrated cookbook, "The Science of Good Cooking," by the editors of America's Test Kitchen and Guy Crosby, Ph.D. Here are recipes for chewy brownies and classic brownies from the new book.

Recipe: Chewy brownies (on this page) Recipe: Classic brownies (on this page)

© 2013 NBCNews

Recipe: Chewy brownies

Ingredients
  • 1/3 cup (1 ounce) Dutch-processed cocoa
  • 1 1/2 teaspoons instant espresso powder (optional)
  • 1/2 cup plus 2 tablespoons boiling water
  • 2 ounces unsweetened chocolate, chopped fine
  • 1/2 cup plus 2 tablespoons vegetable oil
  • 4 tablespoons unsalted butter, melted
  • 2 large eggs plus 2 large yolks
  • 2 teaspoons vanilla extract
  • 2 1/2 cups (17 1/2 ounces) sugar
  • 1 3/4 cups (8 3/4 ounces) all-purpose flour
  • 3/4 teaspoon salt
  • 6 ounces bittersweet chocolate, cut into 1/2-inch pieces
Preparation

To make the brownies:
1. Adjust oven rack to lowest position and heat oven to 350 degrees. Make foil sling by folding 2 long sheets of aluminum foil so that they are as wide as 13 by 9-inch baking pan (one 13-inch sheet and one 9-inch sheet). Lay sheets of foil in pan perpendicular to one another, with extra foil hanging over edges of pan. Push foil into corners and up sides of pan, smoothing foil flush to pan. Grease foil and set aside.

2. Whisk cocoa, espresso powder, if using, and boiling water together in large bowl until smooth. Add unsweetened chocolate and whisk until chocolate is melted. Whisk in oil and melted butter. (Mixture may look curdled.) Add eggs, yolks, and vanilla and continue to whisk until smooth and homogeneous. Whisk in sugar until fully incorporated. Whisk together flour and salt in small bowl and then mix into batter with rubber spatula until combined. Fold in bittersweet chocolate pieces.

3. Transfer batter to prepared pan; spread batter into corners of pan and smooth surface. Bake until toothpick inserted in center of brownies comes out with few moist crumbs attached, 30 to 35 minutes, rotating pan halfway through baking. Transfer pan to wire rack and let cool for 11/2 hours.

4. Remove brownies from pan using foil. Return brownies to wire rack and let cool completely, about 1 hour. Cut brownies into 2-inch squares and serve. (Brownies can be stored in airtight container at room temperature for up to 3 days.)

Why this recipe works
Brownies are a tricky business; homemade recipes have better flavor, while boxed mixes claim best texture. Our goal was clear: a homemade brownie with chewiness (and a shiny, crisp, crackly top) to rival the boxed-mix standard, but flush with a rich, deep, all-natural chocolate flavor. What it all comes down to is the ratio of saturated to unsaturated fats.

Go for chew: Most homemade brownies are either super-rich and fudgy or more cakelike and less rich. The difference between the two styles is simply the ratio of chocolate to flour. Chewy brownies, like the kind you get from a boxed mix, are very hard to make from scratch. We tried all kinds of tricks — everything from using condensed milk and biscuit mix instead of flour to cooking the sugar and butter into a caramel — but nothing worked. We even replaced the granulated sugar with brown sugar, but that only caused us to lose the shiny, crackly top that we expect from good brownies.

Look to the box: It turns out that the whole key to the texture of a box brownie resides in the specific types and amounts of fat it includes. To get boxed-mix brownie chew in homemade, we discovered the perfect proportion of liquid to solid fat, without the aid of high-tech fats used by brownie mix makers. It all came down to the magic 1:3 ratio of saturated to unsaturated fat (as opposed to the 2:1 ratio found in homemade brownies made with butter). We balance the saturated fat of butter with unsaturated vegetable oil. To simplify the calculations in our version we chose to eliminate melted chocolate and use cocoa powder, which contains very little fat by comparison.

Add extra yolks: To reduce greasiness, we first tried reducing the overall fat content but found that left the brownies dry. We remembered that emulsifiers can help prevent fats from separating and leaking out during baking. We tried using mayonnaise, which worked surprisingly well, producing brownies with a rich, luxurious texture. But when we dove deeper, we identified the active emulsifier in the mayonnaise as lecithin, a phospholipid that occurs naturally in egg yolks. Rather than using mayonnaise, the simple addition of two extra yolks in exchange for a little oil made greasiness a thing of the past.

Bloom the cocoa: At this point, our recipe relied on just cocoa. We realized we could replace some of the butter in our recipe with unsweetened chocolate without changing the ratio of fats. We poured boiling water over the cocoa to bloom its flavor and added a little instant espresso for intensity. We then whisked in the chocolate until melted.

End with chunks of chocolate: Only chocolate that is melted and incorporated into the batter actually affects the ratio of fats in the mix. Therefore, for even more chocolate flavor, we incorporate chocolate chunks into the mixed batter. Because they don’t melt until the batter starts baking, they have no effect on texture. The final results are as close to a boxed-mix texture as any home cook could produce without the benefits of industrial processing: chewy, fudgy bars with gooey pockets of melted chocolate that evoke images of bake sales past, but with complex flavor and just enough adult flourish to lift them out of the realm of child’s fare.

Tips

Blooming cocoa in hot water — or hot coffee — is the key to bringing out the deep chocolate flavor of this concentrated source of cocoa solids. Cocoa powder is an important ingredient, both for its flavor and for the fact that it contains little fat, which can negatively affect the texture of chewy brownies or sturdy cupcakes.

For an accurate measurement of boiling water, bring a full kettle of water to a boil, then measure out the desired amount. For the chewiest texture, it is important to let the brownies cool thoroughly before cutting. If your baking dish is glass, let the brownies cool for 10 minutes, then remove them promptly from the pan (otherwise, the superior heat retention of glass can lead to overbaking). Use high-quality chocolate in this recipe.

Serving Size

Makes 24 brownies.

Recipe: Classic brownies

Ingredients
  • 1 1/4 cups cake flour
  • 3/4 teaspoon baking powder
  • 1/2 teaspoon salt
  • 6 ounces unsweetened chocolate, chopped fine
  • 12 tablespoons unsalted butter, cut into 6 pieces
  • 2 1/4 cups sugar
  • 4 large eggs
  • 1 tablespoon vanilla extract
  • 1 cup pecans or walnuts, toasted and chopped coarse (optional)
Preparation

To make the brownies:
1. Adjust oven rack to middle position and heat oven to 325 degrees. Make foil sling by folding 2 long sheets of aluminum foil so that they are as wide as 13 by 9-inch baking pan (one 13-inch sheet and one 9-inch sheet). Lay sheets of foil in pan perpendicular to one another, with extra foil hanging over edges of pan. Push foil into corners and up sides of pan, smoothing foil flush to pan. Grease foil and set aside.

2. Whisk flour, baking powder, and salt in medium bowl until combined; set aside.

3. Melt chocolate and butter in medium heatproof bowl set over saucepan of barely simmering water, stirring occasionally, until smooth. Off heat, gradually whisk in sugar. Add eggs, 1 at a time, whisking after each addition, until thoroughly combined. Whisk in vanilla. Add flour mixture in 3 additions, folding with rubber spatula until batter is completely smooth and homogeneous.

4. Transfer batter to prepared pan; spread batter into corners of pan and smooth surface. Sprinkle toasted nuts, if using, evenly over batter. Bake until toothpick inserted in center of brownies comes out with few moist crumbs attached, 30 to 35 minutes, rotating pan halfway through baking. Let brownies cool in pan on wire rack to room temperature, about 2 hours. Remove brownies from pan using foil. Cut brownies into 2-inch squares and serve. (Brownies can be stored at room temperature for up to 3 days.)

Why this recipe works
Chewy and chocolaty, brownies should be a simple and utterly satisfying affair. But too often, brownies are heavy, dense and remarkably low on chocolate flavor. We wanted old-fashioned brownies that had serious chocolate flavor. To get that tender texture and delicate chew, we shelved the all-purpose flour in favor of cake flour; a bit of baking powder further lightened the crumb. Getting the number of eggs just right prevented our brownies from being cakey or dry. Plenty of unsweetened chocolate provided maximum chocolate flavor.

Use unsweetened chocolate: Ounce for ounce, unsweetened chocolate has more chocolate flavor than bittersweet or semisweet chocolate (which are one-third to one-half sugar). Using a hefty amount of unsweetened chocolate gives us brownies that aren’t too sweet but have profound chocolate notes. A big dose of vanilla (a full tablespoon) helps reinforce the chocolate flavor.

Add cake flour: Chocolate contains starch, and if you’re using a lot of chocolate (which we do here) it can negatively impact the texture of brownies. Switching from the usual all-purpose flour to cake flour (which has a lower protein content) makes the brownies fine-textured (not gritty) and tender. A little baking powder also lightens the texture a bit so they are not overly dense and fudgy.

Toast the nuts: If we mix nuts into the batter before baking the brownies, they steam and become soft. Sprinkling the nuts on top just before baking keeps them dry and crunchy; toasting them first makes them even crunchier while also enhancing their flavor.

Don’t overbake: Chocolate flavor really suffers when baked goods are overbaked. Using a 325-degree oven ensures even baking (the edges don’t dry out, which can be a problem when making a large tray of brownies, as we are here). Also, don’t overbake brownies — you want a toothpick to come out of the brownies with a few moist crumbs still attached.

Make a foil sling: To make it easier to remove brownies from the baked pan, we line it with two pieces of aluminum foil, which are greased. Once the brownies have cooled, use the foil to lift the entire slab onto a cutting board; remove the foil and cut the brownies into neat squares.

Tips

Be sure to test for doneness before removing the brownies from the oven. If underbaked (the toothpick has batter, not just crumbs, clinging to it), the brownies will have a dense and gummy texture; if overbaked (the toothpick comes out completely clean), the brownies will be dry and cakey. To melt the chocolate in a microwave, heat it at 50 percent power for two minutes. Stir the chocolate, add the butter, and continue heating until melted, stirring once every additional minute.

Serving Size

Makes 24 brownies.

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