Vegetarian Quinoa Veggie Stir-Fry

Heat olive oil in a large saucepan over medium heat. Sauté the onion until it becomes translucent, about 5 minutes. Add garlic and quinoa, then reduce heat to medium-low. Cook, stirring frequently, until the quinoa turns light brown and releases a toasted fragrance, about 5 to 7 minutes. Gradually pour in the stock, stirring constantly. Bring the mixture to a boil over medium heat. Add zucchini, mushrooms, and celery; season with salt and black pepper to taste. Reduce heat to medium-low and simmer, stirring occasionally, until vegetables are tender, around 15 minutes. Stir in spinach and garbanzo beans, then simmer until quinoa is fully cooked, another 10 to 15 minutes.