• Preheat the oven to 350℉. Line a 9x13 baking pan with parchment paper. Set aside.

  ^{* I like to spray the pan first with cooking spray and then line it with parchment paper. The spray helps the paper adhere and stick to the pan easier.}

Chocolate Chip Cookie Layer

• In a mixing bowl stir together the dry chocolate chip cookie mix and miniature semi-sweet chocolate chips.
  1 bag (17.5 oz) chocolate chip cookie mix, 1/4 cup miniature semi-sweet chocolate chips
• Pour in the melted butter and egg, and mix thoroughly until a thick dough forms that feels slightly sticky.
  1/2 cup (1 stick) salted butter, 1 large egg
• Press the cookie dough into the prepared pan in an even layer. Use lightly floured fingers to help spread it out without it being too sticky. You can also use a slightly wet rubber spatula to help spread it out as well.

Oreo Cookie Layer

• Place the Double-Stuf Oreo cookies in an even layer, in even rows, over top the cookie dough layer. You may have to break some cookies in half to get them to fit.
  1 package (14.3 oz) Double-Stuf Oreos

Brownie Layer

• Pour the dry brownie mix into a large mixing bowl and stir in the miniature semi-sweet chocolate chips.
  1 box (18.3 oz) brownie mix, 1 cup miniature semi-sweet chocolate chips
• Add in the eggs, melted butter, and milk. Stir to combine, making sure to scrape down the sides and bottom of the bowl to ensure that everything is mixed well.
  2 large eggs, 4 tablespoons salted butter, 1/4 cup milk
• Pour the brownie batter over top the Oreo cookie layer. Take your time to cover the entire cookie layer as you pour the brownie batter. Use a spatula to even out the brownie layer if needed so that it covers the cookie layer.

Bake

• Put the brownies into the oven and cook for 45-50 minutes or until the top is set and a toothpick inserted into the center comes out clean.
• Remove the brownies from the oven and allow them to cool, inside the pan at room temperature, for at least 1 hour before cutting into squares.