Black Bean, Sweet Potato and Quinoa Chili

I found this recipe on The Kitchn a few weeks ago. Since finding it, I think Emily and I have made it at least three times. So easy and so good too!

1 tablespoon olive oil
1 onion, chopped
5 garlic cloves, chopped
1 1/2 tablespoons chili powder
1 tablespoon ground coriander
1 14.5-ounce can fire-roasted tomatoes
1/2 pound dried black beans, rinsed well
1 chipotle chile from a can in adobo, minced (I used a little chipotle chile powder instead)
1 teaspoon dried oregano
2 teaspoons kosher salt + more to taste
1 1/2 cups sweet potatoes (2-3 small), cut in 1/2-inch cubes
1/4 cup quinoa, rinsed and drained
sour cream, to top (optional)
green onions, chopped, to top (optional)
fresh cilantro, chopped, to top (optional)

Heat the oil in heavy large pot over medium heat. Add the onion and cook until soft and beginning to brown, 6-7 minutes. Add garlic, chili powder, and coriander and stir. Cook together for 1 minute.

Stir in the tomatoes with their juices, beans, chipotle pepper, and oregano. Add 5 cups of water and bring to a boil. Reduce heat to low, cover with lid slightly ajar and simmer until beans are flavorful and tender, anywhere from 2 - 4 hours (depending on the age of your beans).

After 1 1/2 hours of cooking, add the sweet potatoes, quinoa, and salt. Place the pot's lid back on slightly ajar and allow to simmer on low heat until the beans are soft and the sweet potatoes and quinoa are cooked through. Add more water if the chili becomes too thick. Season to taste with salt and pepper. Serve with sour cream, cilantro, and green onion.