01 - Preheat oven to 325°F. Grease and line the bottom of a 9-inch springform pan.
02 - Combine crushed cookies and melted butter thoroughly. Press mixture evenly into the prepared pan. Freeze while assembling other layers.
03 - In a mixing bowl, beat butter, brown sugar, and granulated sugar until light and fluffy. Add milk and vanilla, mixing to incorporate. Stir in heat-treated flour and salt until just combined. Fold in mini chocolate chips. Shape most of the dough into marble-sized balls, reserving a portion for the topping if desired. Refrigerate cookie dough balls until ready to use.
04 - Beat cream cheese and granulated sugar until completely smooth. Add eggs one at a time, mixing well after each. Blend in sour cream, vanilla, and all-purpose flour just until incorporated.
05 - Pour half the cheesecake batter over the chilled crust. Evenly scatter half of the cookie dough balls over the batter. Cover with remaining cheesecake batter, smoothing the surface. Arrange reserved cookie dough balls on top if desired.
06 - Bake for 55 to 65 minutes until edges are set and center maintains a slight wobble. Turn off oven, crack the door, and let cheesecake cool inside for 1 hour.
07 - Remove cheesecake from oven and allow to cool completely at room temperature. Refrigerate for at least 4 hours or overnight until thoroughly chilled.
08 - Top with additional mini chocolate chips and reserved cookie dough balls if desired. Slice with a sharp knife and serve chilled.