01 - Preheat oven to 325°F (160°C). Grease and line the base of a 9-inch (23 cm) springform pan.
02 - Combine crushed chocolate cookies and melted butter until mixture resembles wet sand. Press firmly and evenly onto the base of the prepared pan. Place crust in freezer while preparing the dough and filling.
03 - Using an electric mixer, beat softened butter, brown sugar, and granulated sugar until light and creamy. Blend in milk and vanilla, then add heat-treated flour and salt, mixing until just combined. Fold in mini chocolate chips. Roll most of the dough into marble-sized balls, reserving a portion for garnish. Refrigerate the dough balls until needed.
04 - Beat softened cream cheese with granulated sugar until completely smooth. Incorporate eggs one at a time, scraping down the bowl after each addition. Mix in sour cream, vanilla extract, and flour just until blended.
05 - Spread half the cheesecake batter over the chilled crust. Evenly distribute half of the cookie dough balls over the batter. Gently pour the remaining batter on top and smooth the surface. Arrange reserved cookie dough balls on top, if desired.
06 - Bake in the center of the oven for 55 to 65 minutes, until the edges are set but the center remains slightly wobbly. Turn the oven off, crack the door, and allow cake to cool inside for 1 hour.
07 - Remove cheesecake from the oven and let cool completely at room temperature. Cover and refrigerate for at least 4 hours or overnight until fully set.
08 - Before serving, scatter mini chocolate chips and reserved cookie dough balls on top. Slice with a sharp knife and present chilled.