Southwestern Vegetable Chowder

Heat oil in a large pot over medium heat. Add onion and celery; cook, stirring frequently, until softened and beginning to brown, 3 to 6 minutes. Sprinkle flour, chili powder, cumin, oregano and salt over the vegetables and cook, stirring, for 1 minute more. Add vegetable broth and milk; bring to a gentle boil, stirring constantly.

Stir in sweet potatoes and peppers and bring just to a simmer. Simmer, uncovered, stirring occasionally, until the vegetables are tender, 12 to 15 minutes.

Add black beans and cook, stirring frequently, until heated through, 2 to 4 minutes. Serve topped with cilantro and pepitas, and garnished with lime wedges, if desired.