Preheat oven to 400° F. Line a jelly roll pan with tin foil. Spray with non stick cooking spray. Set aide.
In a large microwave safe bowl melt butter and chocolate chips until smooth (~45-60 seconds).
Stir in sugar, eggs, salt and vanilla.
Gradually stir in flour a little at a time until just combined.
Evenly spread batter into prepared pan. Bake for 8-10 minutes or until a tooth pick inserted in the center comes out clean.
<b> For The Oreo Filling </b>
Combine all ingredients in a large mixing bowl. Mix until smooth.
<b> For Assemble your Oreo Brownies </b>
Run a knife around the edge of the brownies. Flip over onto a flat surface. Cut in half with a knife.
Evenly spread filling onto half of the brownie. Top with the other half of the brownie.