Heat the olive oil in a skillet over low heat, and cook the onion and garlic for about 5 minutes, until tender. Mix in the carrots, squash, and zucchini. Continue to cook and stir for 2 minutes. Remove pan from heat, and mix in oats, cheese, and egg. Stir in soy sauce, transfer the mixture to a bowl, and refrigerate 1 hour.
Preheat the grill for high heat.
Place the flour on a large plate. Form the vegetable mixture into eight 3 inch round patties. Drop each patty into the flour, lightly coating both sides.
Oil the grill grate, and grill patties 5 minutes on each side, or until heated through and nicely browned.
