America's Test Kitchen LogoCook's Country LogoCook's Illustrated LogoAmerica's Test Kitchen LogoCook's Country LogoCook's Illustrated Logo

Cast Iron Brownie

By Lawman Johnson

Published on February 22, 2022

Time

50 minutes, plus 35 minutes cooling

Yield

Serves 12 to 14

Cast Iron Brownie

Ingredients

2 ounces (57 grams) marshmallow (about 8 large marshmallows)½ cup plus 2 tablespoons warm tap water 4 tablespoons unsalted butter, cut into 4 pieces2 ounces (57 grams) unsweetened chocolate, chopped fine⅓ cup (1 ounces/28 grams) Dutch-processed cocoa powder 2 ½ cups (17 1⁄2 ounces/496 grams) sugar ½ cup vegetable oil 2 large eggs plus 2 large yolks2 teaspoons vanilla extract 1 ¾ cups (8 3⁄4 ounces/248 grams) all-purpose flour 1 teaspoon table salt 6 ounces (170 grams) bittersweet chocolate, chopped

Before You Begin

In step 3, you can substitute bittersweet or semisweet chocolate chips for the chopped bittersweet chocolate, if desired, but the chips won’t melt as much as the chopped chocolate and will be less gooey. We suggest serving the warm brownies with ice cream; cooled brownies can be wrapped in plastic wrap and stored for up to four days.

Instructions

  1. Adjust oven rack to lowest position and heat oven to 350 degrees. Grease 12-inch cast-iron skillet.
  2. Combine marshmallows, warm tap water, butter, unsweetened chocolate, and cocoa in large bowl. Microwave at 50 percent power, stirring occasionally, until chocolate is fully melted and mixture is smooth, 2 to 4 minutes. Let cool for 5 minutes.
  3. Whisk in sugar, oil, eggs and yolks, and vanilla until fully combined. Gently whisk in flour and salt until just incorporated. Stir in bittersweet chocolate.
  4. Transfer batter to prepared skillet. Bake until toothpick inserted in center comes out with few moist crumbs and batter attached (be careful not to overbake; brownie will continue to bake as it cools), 33 to 38 minutes, rotating skillet halfway through baking. Transfer skillet to wire rack and let cool for 30 minutes (or let cool completely for neat slices). Slice into wedges. Serve warm.
Cast Iron Brownie
Photography by Steve Klise. Styling by Elle Simone.

Cast Iron Brownie

Save

Time

50 minutes, plus 35 minutes cooling

Yield

Serves 12 to 14

Ingredients

2 ounces (57 grams) marshmallow (about 8 large marshmallows)
½ cup plus 2 tablespoons warm tap water
4 tablespoons unsalted butter, cut into 4 pieces
2 ounces (57 grams) unsweetened chocolate, chopped fine
⅓ cup (1 ounces/28 grams) Dutch-processed cocoa powder
2 ½ cups (17 1⁄2 ounces/496 grams) sugar
½ cup vegetable oil
2 large eggs plus 2 large yolks
2 teaspoons vanilla extract
1 ¾ cups (8 3⁄4 ounces/248 grams) all-purpose flour
1 teaspoon table salt
6 ounces (170 grams) bittersweet chocolate, chopped

Test Kitchen Techniques

Ingredients

2 ounces (57 grams) marshmallow (about 8 large marshmallows)
½ cup plus 2 tablespoons warm tap water
4 tablespoons unsalted butter, cut into 4 pieces
2 ounces (57 grams) unsweetened chocolate, chopped fine
⅓ cup (1 ounces/28 grams) Dutch-processed cocoa powder
2 ½ cups (17 1⁄2 ounces/496 grams) sugar
½ cup vegetable oil
2 large eggs plus 2 large yolks
2 teaspoons vanilla extract
1 ¾ cups (8 3⁄4 ounces/248 grams) all-purpose flour
1 teaspoon table salt
6 ounces (170 grams) bittersweet chocolate, chopped

Test Kitchen Techniques

Ingredients

2 ounces (57 grams) marshmallow (about 8 large marshmallows)
½ cup plus 2 tablespoons warm tap water
4 tablespoons unsalted butter, cut into 4 pieces
2 ounces (57 grams) unsweetened chocolate, chopped fine
⅓ cup (1 ounces/28 grams) Dutch-processed cocoa powder
2 ½ cups (17 1⁄2 ounces/496 grams) sugar
½ cup vegetable oil
2 large eggs plus 2 large yolks
2 teaspoons vanilla extract
1 ¾ cups (8 3⁄4 ounces/248 grams) all-purpose flour
1 teaspoon table salt
6 ounces (170 grams) bittersweet chocolate, chopped

Test Kitchen Techniques

Why This Recipe Works

A 12-inch cast-iron skillet can handle just about any meal, from breakfast to dessert—and brownies are no exception. The best ones have crispy, chewy edges and rich, fudgy middles. A combination of Dutch-processed cocoa powder and unsweetened chocolate created complexity, and a little vanilla added more depth. To achieve that perfect fudginess, we took inspiration from fudge. Many fudge recipes call for marshmallows or a marshmallow product. By simply melting some marshmallows along with the cocoa powder mixture, we created a superfudgy batter. Finally, we folded in bittersweet chocolate chunks for gooey pockets of lush melted chocolate throughout the brownie. A well-greased skillet ensured that there weren’t any issues when removing the brownie wedges from the pan. We baked the brownie on the bottom rack of a preheated 350-degree oven for about 35 minutes and then allowed it to bake further on a wire rack (due to the cast iron’s strong heat retention), resulting in the right soft and fudgy interior. Every wedge offered a crisp edge and fudgy middle. Top with a scoop or two of your favorite ice cream.

Before You Begin

In step 3, you can substitute bittersweet or semisweet chocolate chips for the chopped bittersweet chocolate, if desired, but the chips won’t melt as much as the chopped chocolate and will be less gooey. We suggest serving the warm brownies with ice cream; cooled brownies can be wrapped in plastic wrap and stored for up to four days.

Instructions

  1. Adjust oven rack to lowest position and heat oven to 350 degrees. Grease 12-inch cast-iron skillet.
  2. Combine marshmallows, warm tap water, butter, unsweetened chocolate, and cocoa in large bowl. Microwave at 50 percent power, stirring occasionally, until chocolate is fully melted and mixture is smooth, 2 to 4 minutes. Let cool for 5 minutes.
  3. Whisk in sugar, oil, eggs and yolks, and vanilla until fully combined. Gently whisk in flour and salt until just incorporated. Stir in bittersweet chocolate.
  4. Transfer batter to prepared skillet. Bake until toothpick inserted in center comes out with few moist crumbs and batter attached (be careful not to overbake; brownie will continue to bake as it cools), 33 to 38 minutes, rotating skillet halfway through baking. Transfer skillet to wire rack and let cool for 30 minutes (or let cool completely for neat slices). Slice into wedges. Serve warm.

Gift This Recipe

Enjoyed this dish? Let others know by sharing it as a gift recipe.

This is a members' feature.