1. Bring broth, sweet potato, and quinoa to a boil in saucepan over medium heat. Cover, reduce heat to medium low, and simmer 20 minutes, or until quinoa is tender. Transfer to bowl to cool.
2. Stir chickpeas, zucchini, pumpkin seeds, ground flaxseeds, basil, salt, pepper, chili powder, and thyme into quinoa mixture, mashing chickpeas and sweet potato but leaving some chunks. Shape mixture into 8 patties.
3. Preheat oven to 400°F, or preheat grill to medium-high.
4. Heat oil in large skillet over medium heat. Cook patties 2 to 3 minutes per side, or until lightly golden brown. Remove from heat, and either place on baking sheet, and bake 15 minutes, or cook on grill 8 to 10 minutes, turning once.