Preheat oven to 325°F (160°C). Prepare a 9-inch springform pan with parchment and grease.
Mix crushed cookies with melted butter, press into pan base, and freeze.
Beat softened butter, sugars, add milk, vanilla, flour, salt, and fold in mini chocolate chips. Form cookie dough balls and refrigerate.
Beat cream cheese and sugar until smooth, add eggs one at a time, then sour cream, vanilla, and flour.
Pour half the batter over crust, add half the cookie dough balls, then top with remaining batter and cookie dough balls. Bake 55-65 minutes, cool, then refrigerate.
Notes
Chill thoroughly before serving for best flavor and texture.