1
Bring quinoa and water to a boil in a medium pot. Reduce heat to medium low, cover and simmer until liquid is absorbed, 20 to 30 minutes. Set aside off of the heat for 5 minutes, then fluff with a fork and set aside to let cool.
2
Preheat oven to 400°F. In a large bowl, combine cooked quinoa with onion, garlic, carrots, squash, spinach, zest, flour, baking powder, egg, salt and pepper. Form mixture into eight (4- to 5-inch) patties and arrange on an oiled baking sheet. Bake, flipping halfway through, until lightly browned and just crisp, about 25 minutes.