In a large dutch oven or heavy-bottomed pan, heat the oil over medium heat. Once the oil is heated, add in the diced onion and saute for 3-5 minutes until the onion is softened. Add in the garlic and saute for 30-60 seconds, just to toast.
Add the broth, cubed sweet potato, black beans, tomatoes, quinoa, and seasonings into the pan.
Turn the heat to high heat and bring the mixture to a boil. Once bubbling, reduce the heat to medium-low and simmer for 25-30 minutes, uncovered, until the sweet potatoes are tender. If you find the liquid is evaporating too quickly, reduce the heat to low and add a splash more broth as needed to thin.
Once thickened, remove from the heat. Stir in the juice of a fresh lime and taste to adjust salt if needed. Serve plain or with toppings of choice.
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Notes
Storage: Store leftovers in an airtight container for up to 5 days in the refrigerator or in a freezer-safe container, leaving room for expansion, for up to 3 months. To reheat, add in a splash of water or stock and heat gently over medium heat on the stove or in 1-minute intervals in the microwave.Quinoa: Be sure to rinse the quinoa to rid it of its bitter taste. You may also omit the quinoa--it adds bulk and protein, but this chili is delicious without it.Chili Seasoning: In place of the seasonings (chili powder, salt, cumin, cayenne, garlic powder, and onion powder) use 1½ tablespoons of homemade chili seasoning or your favorite chili blend. Swap the beans: Pinto or red beans both work in place of black beans.Slow Cooker Option: Sauté onion and garlic in 1 tablespoon oil in a small non-stick skillet for 3-5 minutes, then add to base of slow cooker. Add remaining ingredients (minus the lime juice) and stir to combine. Cook on low for 8 hours or high for 5-6 hours until the sweet potatoes are perfectly tender.