The night before, place your ice cream churning bowl in the freezer to properly chill. Also, make sure you soak your cashews overnight OR the next day for at least 6 hours. Be sure to drain thoroughly before adding to blender.
Grind your banana chips in a coffee or spice grinder or with a mortar and pestle. If using a spice grinder, not all of the chips will grind. Pick out parts that didn't grind for other uses.
Add all ice cream ingredients EXCEPT raw banana and cookies to blender and blend until creamy and smooth, scraping down sides as needed. Use the “liquify” or "puree" setting if you have it to get it completely creamy and blended. Taste and adjust flavor as needed, adding more banana powder or dates if desired.
Chill mixture in the freezer for 2 hours, or in the fridge overnight. If you don't have an ice cream maker, see notes.
Add chilled mixture to ice cream maker and churn according to manufacturer’s instructions - about 45 minutes. It should look like soft serve.
For a true blizzard experience, spoon directly into 2-3 serving glasses (as original recipe is written // adjust if altering batch size) and layer with fresh sliced bananas and crushed vegan cookies. Optional, top with coconut whipped cream.
Alternatively, transfer mixture to a freezer safe container, cover and freezer until firm - about 4-6 hours and scoop as ice cream.
*If you don't have an ice cream maker, pour blended batter into an ice cube tray, freeze, and then blend into a thick shake with a little more coconut milk or almond milk. *Nutrition information is a rough estimate.