Preheat oven to 350 degrees. Line an 8x8 baking dish with parchment paper or aluminum foil, light grease. Set aside.

Crust - Pulse the Oreo cookies in a food processor into fine crumbs. Add into a medium mixing bowl.

Pour the melted butter into the mixing bowl with the crushed Oreos. Mix together.

Pour the crust into the baking dish, using a large spatula spread out the crust. Make sure it is even all around.

Filling - In a large mixing bowl, cream the cream cheese and egg and mix for 3-5 minutes until it is creamy.

Add in the white granulated sugar and vanilla extract.

Fold in the chopped Reese's Cups.

Spoon the cheesecake mixture on top of the crust.

Bake for 30-35 minutes, or until the cheesecake has set-up and the edges are lightly browned.

Allow for the bars to cool for 30 minutes at room temperature and then chill in the refrigerator for at least 3 hours. Overnight is best.

Lift the foil of out the pan and cut into squares.