Ingredients
1 stick unsalted butter, cut into large pieces
6 ounces bittersweet chocolate, coarsely chopped (1 cup)
1 1/2 cups sugar
3 large eggs
1/4 cup unsweetened cocoa powder
1/2 teaspoon kosher salt
1/2 cup plus 2 tablespoons unbleached all-purpose flour
1 cup (6 ounces) milk-chocolate chips
1 cup (6 ounces) white-chocolate chips
Preparation
Preheat oven to 350 degrees. Place six 4-inch shallow paper baking cups on a baking sheet. In a heatproof bowl set over (not in) a pot of simmering water, melt butter and bittersweet chocolate, stirring until smooth. Remove from heat and whisk in sugar. Whisk in eggs, one at a time, until combined. Whisk in cocoa and salt. Fold in flour until combined. Stir in all chocolate chips.
Fill each cup three-quarters full with batter. Bake until set and a tester inserted into centers comes out with only a few moist crumbs attached, 30 to 35 minutes. Transfer to a wire rack and let cool completely. (Brownies can be stored in an airtight container at room temperature up to 3 days.)
Recipe reprinted from Martha Stewart’s Cookie Perfection: 100+ Recipes to Take Your Treats to the Next Level, From the Kitchens of Martha Stewart Living. Copyright © 2019 by Martha Stewart Living Omnimedia, Inc. Published by Clarkson Potter/Publishers, an imprint of Random House, a division of Penguin Random House LLC.