Preheat the oven to 325°F (160°C). Grease a 9-inch springform pan.
Combine crushed chocolate cookies and melted butter, then press into the bottom of the pan. Set aside.
In a mixing bowl, beat cream cheese and sugar until smooth. Mix in mint extract and food coloring if using.
Add eggs one at a time, beating well after each addition. Stir in heavy cream.
Pour the filling over the crust, then drizzle melted chocolate on top and swirl with a toothpick.
Bake for 50-55 minutes or until the center is set. Cool to room temperature, then refrigerate for at least 4 hours.
Serve chilled, garnished with whipped cream and chocolate shavings.