Pre-heat the oven to 350 and line two sheet trays with silicone mats. Then pierce the two sweet potatoes all over with a fork and place them on a microwave safe plate. Microwave them for 10 minutes on high, then turn them over and microwave them for another 5 minutes. They should be completely soft. While the sweet potatoes cook in the microwave, cook the quinoa. Bring the veggie stock to a low boil in a big saucepan on the stove, then stir in the quinoa. Cover the pan and turn the heat to low. Let it cook until tender for 15 to 20 minutes. Then fluff it up with a fork. 

Scoop the sweet potato flesh out of the skin into a bowl and stir it well with the cooked quinoa. Then stir in the remaining seasonings and spices to flavor it well. Use wet hands to form 10-12 patties out of the mixture, depending on how big you want them. Evenly lay them out on the sheet trays and bake them for 30 minutes, until set and slightly crisp along the edges. Loosen them from the tray with a spatula and serve them immediately however you want! They are great simply served with ketchup or HP sauce, topped with avocado, or like a vegetarian burger!