1Step 1
Preheat the oven to 350 degrees F. Grease a 9-inch square baking pan and line with parchment paper so it extends over sides.
2Step 2
Melt, stirring frequently, in a large saucepan over low heat:
1 stick unsalted butter, cut into cubes
1 cup semisweet chocolate chips
3Step 3
Whisk in until the sugar is dissolved:
½ cup sugar
½ cup packed brown sugar
Once melted, whisk in until just combined:
2 Large Eggs
1 Teaspoon Vanilla
4Step 4
Stir in until just combined:
¾ cup all-purpose flour
1/3 cup unsweetened cocoa powder
¼ teaspoon salt
Scrape into the prepared pan. Sprinkle over the top:
½ teaspoon flaky sea salt
5Step 5
Bake until a toothpick inserted in the center comes out with moist crumbs attached, 18 to 20 minutes. Let cool completely in the pan on a rack before cutting.