01 - Preheat oven to 325°F. Grease and line the bottom of a 9-inch springform pan.
02 - Combine crushed chocolate sandwich cookies and melted butter until evenly coated. Press the mixture firmly into the pan to form an even base. Freeze while assembling the filling and cookie dough.
03 - In a bowl, cream softened butter with brown sugar and granulated sugar until light in color and fluffy in texture. Mix in milk and vanilla extract. Add heat-treated flour and salt, blending just to combine. Fold in mini chocolate chips. Roll most of the dough into marble-sized balls, reserving some for garnish. Refrigerate the dough balls until needed.
04 - Beat softened cream cheese and sugar until smooth and creamy. Incorporate eggs one at a time, mixing briefly after each addition. Blend in sour cream, vanilla, and flour until just combined.
05 - Pour half of the cheesecake mixture over the crust. Evenly distribute half the cookie dough balls over the batter. Pour the remaining cheesecake filling on top and smooth the surface. Gently place the remaining cookie dough balls on the surface if desired.
06 - Bake for 55 to 65 minutes, or until the edges are set and the center is just slightly wobbly. Turn off the oven, crack the door, and allow the cheesecake to cool for 1 hour in the oven.
07 - Remove from oven. Allow to cool completely at room temperature, then refrigerate for at least 4 hours or overnight for optimal texture.
08 - Before serving, sprinkle with mini chocolate chips and extra cookie dough balls, if desired. Slice with a sharp knife and serve well-chilled.