01 -
Line an 8x8 inch square baking pan with parchment paper, allowing the edges to hang over all four sides. Preheat the oven to 350°F.
02 -
Cream together the softened butter, light brown sugar, and granulated sugar for 2 minutes until light and fluffy. Incorporate the egg yolk and vanilla extract until smooth.
03 -
Fold in all-purpose flour, sea salt, baking soda, and chopped Oreo cookies until just combined. Set the mixture aside.
04 -
Melt the unsalted butter and chocolate chips together until smooth, then set aside to cool slightly.
05 -
In a separate bowl, whisk together granulated sugar, egg, and vanilla extract for about 2 minutes until pale and fluffy. Gently stream in the melted butter and chocolate mixture and mix until just blended.
06 -
Fold in all-purpose flour, unsweetened cocoa powder, and sea salt until just combined.
07 -
Spoon 2-tablespoon sized portions of cookie dough into the prepared baking pan, distributing evenly. Fill the alternate spaces with brownie batter.
08 -
Press down the tops of the cookie dough balls until even with the brownie batter. Sprinkle additional chopped Oreo pieces over the surface.
09 -
Bake at 350°F for 25 to 27 minutes, or until cookie dough is golden and a toothpick inserted into the brownie comes out with moist crumbs. After 20 minutes, tent the pan loosely with foil to prevent over-browning.