Slice the bananas and put in a freezer proof container and freeze for minimum 2 hours.
For Blendtec: Add the coconut milk (start with 1 ounce, add more as needed to blend), spinach, honey, and mint. With the TWISTER JAR or FOURSIDE Jar - Use SPEED 4 for 5 to 10 seconds until spinach is blended. Add the frozen banana + 2 tablespoons of raw cacao nibs or chocolate chips. Press the ICE CREAM button. If cavitation occurs (will not with Twister Jar), stop machine and move ingredients toward the blade. Then use SPEED 4 for until well combined (about 20 - 30 seconds). Careful not to over blend. Add 1 tablespoon of raw cacao nibs and PULSE 2 times.
For Vitamix: Add the spinach, banana, coconut milk and honey and 2 to 3 drops of peppermint. Use VARIABLE speed #2 for 45 seconds, using the tamper to push the ingredients towards the middle, then increase to VARIABLE speed #7 for 10 seconds.
Add the Cacao Nibs and PULSE** 2-3 times.
Serve immediately OR for a traditional ice cream texture, place ice cream into a freezer proof container and freeze for approximately 2 hours or until set, but not hard.
*You can also use an equivalent other sweetener of choice, such as stevia or xylitol. For a non-vegan version, use equal amounts raw honey**If Vitamix does not have a PULSE button with machine off, set to speed 10/high and power on/off 2-3 times.