1 cup (226g) unsalted butter
1 ¼ cups (250g) granulated sugar
¾ cup (150g) light brown sugar, packed
3 large eggs, room temperature
1 ½ teaspoons vanilla extract
1 cup (85g) unsweetened Dutch-process cocoa powder
¾ cup (95g) all-purpose flour
½ teaspoon salt
1 cup (170g) semi-sweet chocolate chips (optional)
👩🍳 Instructions
Preheat oven to 350°F (175°C). Line a 9x9-inch baking pan with parchment paper, leaving overhang on two sides.
In a medium saucepan over medium heat, melt the butter completely. Remove from heat.
Whisk in both sugars until combined and the mixture looks like wet sand.
Add the eggs and vanilla, whisking vigorously for 1 minute until the batter is glossy and pulls away from the sides.
Sift the cocoa powder, flour, and salt over the wet ingredients. Fold gently with a spatula until just combined (do not overmix).
Fold in chocolate chips (if using). Pour the thick batter into the prepared pan and smooth the top.
Bake for 30-35 minutes. The center should still look slightly underdone (a toothpick will have moist crumbs).
Cool completely in the pan on a wire rack before lifting out and cutting into squares.
