Preheat oven to 350º F. Spray 18 muffin cups with non-stick spray.

In a stand mixer cream butter and both sugars together until light and fluffy, about 2 minutes.

Mix in the egg and vanilla.

Add flour, cornstarch, baking soda and salt. Mix until everything is combined. Fold in the chocolate chips.

Scoop 36 balls of dough onto a baking sheet. Flatten balls for dough. Sandwich an Oreo cookie in between 2 pieces of dough. Fold up the sides and press together. Gently roll until the cookie is completely inside the ball of dough.

Place in prepared muffin tin. Bake for 15-17 minute until golden and the top appears dry.

Remove from the oven and cool completely before removing from the muffin tin.