Cheesecake Filling
In a medium-sized mixing bowl, stir together softened cream cheese and sugar until smooth and creamy.
Add sour cream and vanilla extract and stir until smooth and combined.
Drop filling by level 1 Tablespoon-sized scoop onto a wax paper lined baking sheet and transfer to the freezer to firm up while you prepare your cookie dough.
Cookie Dough
In a large bowl using an electric mixer (or in the bowl of a stand mixer) combine butter and sugar and beat until light and fluffy.
Add eggs and vanilla extract and stir well.
In a separate mixing bowl, whisk together flour, cornstarch, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet, stirring until completely combined.
Add chocolate chips and Oreos and use a spatula to fold into the dough until well distributed.
Cover bowl with plastic wrap and chill in the refrigerator for 30 minutes. Meanwhile, line a baking sheet with parchment paper and preheat oven to 375F (190C).
Once dough has chilled, scoop ¼ cup of dough, form into a ball, and use your thumb to press a crater into the center of the dough ball.
Remove cheesecake filling from the freezer and press a dollop into the center of your dough. Fold the cookie dough around the filling, completely concealing it into the center of the cookie. Roll dough between your palms to form into a ball.
Place cookie dough balls onto your parchment paper lined baking sheet, spacing at least 2” (5cm) apart. Bake for 12 minutes or until edges of cookies begin to turn a light golden brown.
Allow cookies to cool completely before serving.