Preheat oven 400F. Put cauliflower and onion in food processor until you have a granular mixture. Transfer mixture into a large bowl.
In your large bowl, add flour, potato starch or cornstarch, onion powder, salt, and stir until all the flour has been well incorporated into cauliflower mix.
Line 2 baking sheets with parchment paper and brush with olive oil.
Shape your patties into little balls and flatten them to make circles that are about 4 inches in diameter and 1 inch thick. You can also use a circular mold or if you have other fun shapes your child might enjoy.
Brush patties with remaining olive oil.
Bake for 40 minutes, turning after 25 min. If using a convection oven, reduce time to 30 minutes, turning at about 20.
