Preheat your oven to 350°F (175°C). Line a muffin tin with cupcake liners. In a medium bowl, combine the softened butter, granulated sugar, brown sugar, powdered sugar, and a pinch of salt. Mix until creamy. Add in the vanilla extract and stir until well combined. Gradually add the all-purpose flour and mix until a soft dough forms. Finally, fold in the mini chocolate chips.
Take about a tablespoon of the cookie dough mixture and press it into the bottom of each muffin liner to form the crust. Make sure it is evenly spread across the bottom.
In a separate mixing bowl, beat the softened cream cheese until smooth. Add granulated sugar, flour, vanilla extract, and the egg. Mix until everything is well combined and there are no lumps.
Spoon the cheesecake filling over the cookie dough crusts in each muffin cup. Fill until about three-quarters full to allow for rising.
Place the muffin tin in the preheated oven and bake for 18-20 minutes, or until the cheesecakes are set around the edges but slightly jiggly in the center.
Remove the cheesecakes from the oven and allow them to cool in the pan for about 10 minutes. Then, transfer them to a wire rack to cool completely. Once cooled, top with extra mini chocolate chips and any leftover cookie dough if desired.