Preheat oven to 325°F (163°C). Line a cupcake pan with cupcake liners and add one Oreo to the bottom of each liner.
In a large bowl, mix the cream cheese, sugar, and sour cream until smooth and well combined.
Add mint extract and a small amount of green gel color, if using, and mix until evenly colored.
Add eggs one at a time, mixing slowly after each addition. Do not overmix.
Add flour and mini chocolate chips, and gently fold to combine.
Spoon the mixture evenly over the Oreo crusts in each liner.
Bake for 15-18 minutes or until centers are set. Remove from oven and cool completely.
Refrigerate for at least 3 hours or overnight before serving.
Top with whipped cream, crushed Oreos, and mini chocolate chips if desired.