While the sweet potato is roasting, heat olive or avocado oil in a large non-stick skillet over medium high heat. Once hot, add the diced onion and sauté until the onion begins to carmalize a little, about 5 minutes. Add in 3 minced cloves of garlic and sauté 30 seconds longer. Stir in 1 cup water, 14.5 oz undrained diced tomatoes, 1 ½ cups cooked quinoa, 1 ½ teaspoons chili powder, 1 teaspoon cumin, ½ teaspoon paprika, ¼ teaspoon cayenne, ¼ teaspoon coriander and season with salt and pepper to taste. Bring mixture to a boil, then reduce heat, cover saucepan with lid and simmer about 15 minutes, until water has evaporated.