Preheat oven to 350°F and add muffin liners to a 12-cup muffin tin.
Twist apart 6 Oreos and place one cookie (1/2 of an Oreo) on the bottom of each of the muffin cups.
6 Oreo cookies
In the bowl of a stand mixer, add the cream cheese. Beat until smooth.
2 8-ounce packages cream cheese
Add the sugar, sour cream, eggs and vanilla and mix until smooth.
1/2 cup sugar, 1/4 cup sour cream, 2 eggs, 1 teaspoon vanilla extract
Crush 7 of the remaining Oreo cookies into the filling mixture; stir.
7 Oreo cookies
Scoop the filling into each of the 12 muffin cups. They will be filled to the top.
Bake for 15-17 minutes or until the centers of each of the cheesecakes are JUST set. (Don't overbake - cheesecake is done when an instant thermometer reads 150℉ in the center).
Let cool then top with a dollop of whipped topping.
whipped topping
Combine the chocolate chips and oil in a small bowl. Microwave on a low power level, stirring frequently until smooth.
1/4 cup semi-sweet chocolate chips, 1 teaspoon vegetable oil
Drizzle the chocolate over the mini cheesecakes.
Break the remaining cooking into 4 pieces each and press into the cheesecakes.
3 Oreo cookies
Refrigerate until ready to serve.