Make the crust: Preheat oven to 325°F (163°C). Combine graham crumbs, sugar, and melted butter. Press into bottom of springform pan. Bake 8–10 minutes. Cool slightly.
Prep cookie dough: Cream butter and sugars. Mix in milk and vanilla. Add flour and stir until smooth. Fold in mini chips. Roll into small balls (½–1 tsp) and chill while prepping cheesecake.
Make cheesecake batter: Beat cream cheese and sugar until smooth. Add eggs one at a time. Stir in sour cream and vanilla until creamy.
Assemble: Pour half the batter into crust. Drop in chilled cookie dough balls. Add remaining batter and more dough balls on top, lightly pressing them down.
Bake: Wrap pan in foil and place in water bath. Bake 55–65 minutes or until center is just set. Cool in oven with door ajar for 1 hour, then chill at least 4 hours or overnight.
Serve: Slice, swoon, repeat.