Makes one 13x9 inch pan
Directions
Preheat your oven to 350 degrees F. Prepare a 13x19 inch glass or light metal baking pan by lightly greasing it and lining it with parchment paper. Let the parchment paper overhang the sides so you will be able to remove the brownies in one large piece to cut into squares. Crease the edge of the parchment along the sides to be sure the paper doesn't fold back onto the brownies.
Add the chocolate chips and butter together to a large, heat-resistant bowl. Microwave the butter and chocolate chips on medium-high, stirring after every 30 seconds until the chocolate chips are melted.
Add the granulated and brown sugars to the chocolate mixture, stirring to combine well. Return the chocolate mixture to the microwave and reheat for one minute. Stir well and set aside to cool.
Break the eggs into a bowl and beat slightly with a fork to break up the yolks. When the chocolate mixture has cooled to slightly warm, add the eggs and mix with a whisk until just combined. Overbeating the eggs will result in a cakey brownie texture. Stir in the vanilla.
Mix the flour, salt, and cocoa powder together in a small bowl. Add the flour mixture all at once to the chocolate mixture. Fold the flour mixture into the chocolate mixture using a silicone spatula.
Spread the batter into the prepared pan. Bake for 30-35 minutes or until a toothpick inserted in the center has a few moist bits on it. Cool completely before cutting.