Step 1

Preheat oven to 350° F. Spray and 8x8 baking pan with nonstick cooking spray. Line with tin foil or parchment paper and spray again. Set aside.

Step 2

In a bowl, whisk together the flour, salt and baking soda. Set aside.

Step 3

In a stand mixer fitted with a paddle attachment (or using a hand mixer), cream together the butter and sugars until fluffy and light (I usually mix for 3 minutes). Beat in the egg and vanilla, making sure to scrape down the sides of the mixing bowl.

Step 4

Slowly mix in the flour mixture until combined. Stir the chocolate chips. Set bowl aside (stick it in the fridge if you like).

Step 5

In a double boiler or microwave, melt semisweet chocolate and butter, stirring often. (See tips for melting chocolate). Once melted, whisk in cocoa and let cool.

Step 6

Meanwhile, fit your mixer with a whisk attachment. Whisk together eggs, sugar, vanilla, and salt, just until combined—about 30 seconds. Whisk in the warm chocolate mixture. T

Step 7

Add flour to wet ingredients and stir with a rubber spatula. Set aside.

Step 8

Layer the cookie dough on the bottom of the prepared pan, pressing down to form the bottom of the brownies.

Step 9

Layer as many Oreos that will fit on top of the cookie dough. No need to overlap. (I managed 16).

Step 10

Slowly pour the brownie batter on top of the Oreo layer and make sure it evenly layers on top.

Step 11

Bake for 35 to 40 minutes. Test with a toothpick: if it comes out clean the center is done, if not, let the brownies cook 5 minutes more. Let the brownies cool before serving!