Chocolate Chip Brownies

• 8 tablespoon(s) (1 stick) unsalted butter, cut into pieces, plus more for pan
• 1 cup(s) all-purpose flour, spooned and leveled
• 1/4 cup(s) unsweetened cocoa powder
• 1/2 teaspoon(s) baking powder
• 1/2 teaspoon(s) salt
• 1 cup(s) semisweet chocolate chips
• 8 ounce(s) semisweet or bittersweet chocolate, chopped
• 1 1/4 cup(s) sugar
• 3 large eggs

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Directions

1. Preheat oven to 350 degrees F. Brush a 9-inch square baking pan with butter. Line bottom and two sides with a strip of parchment paper, leaving a 2-inch overhang on the two sides. Butter paper, and set pan aside. In a small bowl, whisk flour, cocoa, baking powder, and salt; set aside.
2. Place butter and chocolate in a large heat-proof bowl set over (not in) a saucepan of gently simmering water. Heat, stirring occasionally, until smooth, 2 to 3 minutes; remove bowl from pan. Add sugar; mix to combine. Add eggs, and mix to combine. Add flour mixture; mix just until moistened (do not overmix). Add chocolate chips. Transfer batter to prepared pan; smooth top.
3. Bake until a toothpick inserted in center comes out with a few moist crumbs attached, 50 to 60 minutes. Cool in pan for 30 minutes. Using paper overhang, lift brownies out of pan; transfer to a rack to cool completely (still on paper). On a cutting board, using a dampened serrated knife, cut into 16 squares. Store in an airtight container at room temperature, up to 2 days.