01 - Preheat oven to 325°F. Line a 9-inch square baking pan with parchment paper, leaving overhang for easy removal.
02 - Combine crushed chocolate cookies and melted butter in medium bowl. Mix until well combined. Press firmly into bottom of prepared pan. Bake for 8 minutes, then set aside.
03 - Beat cream cheese and sugar in large bowl until smooth and creamy. Add sour cream, eggs, peppermint extract, vanilla extract, and food coloring if using. Mix until fully combined and smooth.
04 - Fold in mini chocolate chips until evenly distributed throughout batter.
05 - Pour cheesecake mixture over prepared crust and smooth top. Bake for 30-32 minutes until center is just set and still slightly jiggly. Do not overbake.
06 - Remove from oven and cool completely at room temperature. Refrigerate for at least 2 hours until fully chilled.
07 - Lift bars out of pan using parchment overhang. Cut into 16 squares. Garnish with extra mini chocolate chips and mint leaves if desired.