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 a 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 a 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 the mini chocolate chips until evenly distributed throughout the batter.
05 - Pour cheesecake mixture over prepared crust and smooth top. Bake for 30-32 minutes, or until center is just set and still slightly jiggly. Do not overbake.
06 - Remove from oven and cool completely at room temperature, then 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.