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Export 19 ingredients for grocery delivery
Heat oil in a large stock pot or Dutch oven over medium-high heat until shimmering. Add onions, carrot, celery, bell pepper, chili powder, cumin, coriander, oregano, thyme, chipotle chili powder (if using), 1/2 teaspoon salt, and 1/4 teaspoon pepper. Cook until vegetables have softened, 7 to 10 minutes.
Stir in garlic until fragrant, about 30 seconds. Stir in sweet potatoes, black beans, tomato puree, diced tomatoes and their juice, and water. Bring to a simmer, cover, and cook until the sweet potatoes are tender and starting to break down, about 30 minutes.
Remove lid and continue to simmer until slightly thickened, about 30 minutes longer. Simmer longer for a thicker sauce. Season to taste with salt and pepper. Serve avocado, cilantro, and scallions if desired.