If using the flax egg, mix the ground flax and water in a small bowl and set aside for 5 minutes to thicken.
Add all the ingredients except the breadcrumbs to a large bowl and mix well.
The mixture may be a little watery, so add the breadcrumbs. Start with 3 Tbsp and wait a little so they absorb the excess water. Add more until all the liquid is absorbed and the mixture has a paste-like consistency.
Grease a non-stick pan with a little oil and add the patties, about 1 Tbsp per patty. Fry for 2 minutes on each side.
Notes
Drain the canned corn well and rinse the quinoa before boiling for the best texture. Store leftover patties in an airtight container in the fridge for up to 3 days; reheat in a pan to keep them crisp.