Preheat oven to 350 degrees F and spray a 9x13 inch glass baking pan with cooking spray, then line with a parchment paper sling.

Into a large bowl, mix together flour, cocoa powder, salt, sugar, eggs, butter, and vanilla until combined.

Stir in chocolate chunks, then pour batter into prepared pan. Set aside.

In a large bowl, beat butter, granulated sugar, and brown sugar together until combined.

Beat in egg and vanilla.

Add in flour, baking soda, and salt, then beat until combined.

Stir in chocolate chips.

Use a small cookie scoop to scoop the dough onto the brownie layer - no need to spread or press out.

Bake in preheated oven for 30-40 minutes (we did 40 minutes). The center will still be a little gooey, but the top should be golden brown and the outside edges should be set - an inserted toothpick will come out mostly clean.

Cool for 10 minutes, or until the brookies can easily lifted out of the pan with the sling.

Cool for an additional 10 minutes on a cutting board, then cut and serve.

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