Scrape out the flesh of the avocado and discard the peel and pit. Blend all ingredients until completely smooth, using a blender, food processor or Vitamix. If you have an ice cream maker, transfer the mixture to the machine and churn according to the manufacturer's directions. Eat immediately as soft serve, or freeze in an airtight container for a half hour to achieve a firmer texture. If you don't have an ice cream machine, transfer the blended mixture to an airtight container, freeze and stir every half hour for 2 to 3 hours.
1 frozen large banana, as ripe as possible
Cacao nibs (or chocolate chips)
2 drops pure peppermint extract
2/3 cup milk of choice
1/4 cup frozen spinach
Optional: Cocoa powder
Blend all ingredients and enjoy.