Step 1

Begin by preheating your oven to 350 degrees F. Prepare a 9 x 13 pan by spraying it with baking spray, then lining it with parchment paper, and finally, spraying it again. Set aside.

Step 2

To make the cookie dough, use a medium-sized bowl and whisk together the flour, baking soda, baking powder, and salt. Set aside.

Step 3

In a large bowl, beat together the butter, brown sugar, and granulated sugar on medium-high until light and fluffy. Then, beat in the egg and vanilla extract. Reduce the speed to low and mix in the flour mixture until just incorporated. Stir in the chocolate chips until evenly combined.

Step 4

Next, prepare the brownie batter by melting the butter and chocolate in a heat-proof bowl set over a pot of simmering water. Remove from the heat and then whisk in the sugar. Whisk in the eggs one at a time until combined. Whisk in the cocoa powder, salt, and vanilla. Then use a spatula to fold in the flour until combined.

Step 5

Pour the brownie batter into your prepared pan. Smooth and level the top with a spatula. Then, crumble the cookie dough evenly over the batter.

Step 6

Lightly cover with a piece of foil and bake for 20 minutes. Remove the foil and bake for another 28-30 minutes.

Step 7

Allow to cool completely on a wire rack. Lift the brownies out using the parchment paper and cut into squares. Store extras in an airtight container for 3-4 days.