Make the mochi by mixing all the mochi ingredients in a microwave-safe bowl until no lumps remain. Microwave on high for about 1 minute 20 seconds. Give the mochi dough a quick mix with a spatula to heat any remaining uncooked mochi. Dust your working surface and your hands generously with cornstarch, as the mixture is very sticky. Turn the mochi onto the dusted surface, flatten, and cut and/or roll into desired shapes. Store in an airtight container or covered tightly with plastic wrap until ready to use.
For the milkshake, place all milkshake ingredients in a powerful blender and blend until very smooth. Divide evenly between 2 serving glasses, top with coconut whipped cream, prepared mochi, other fun toppings, and a straw. Enjoy immediately.
Recipe by Radiant Rachels at https://radiantrachels.com/vegan-mochi-matcha-milkshake/