1 medium yellow onion, chopped (about 2 cups)
1 medium red bell pepper, chopped (about 1½ cups)
1 tablespoon finely chopped garlic (about 4 medium cloves)
2 teaspoons chili powder
1 teaspoon dried oregano
1 teaspoon dried basil
1 can (15 ounces) diced tomatoes (1½ cups), not drained
1 can (15 ounces) black beans (1½ cups), drained and rinsed
1 medium zucchini, sliced (about 2 cups)
1 cup raw, frozen, or canned corn (drained)
5 cups coarsely chopped greens (kale, collards, or Swiss chard)
4 (6-inch) corn tortillas, cut into 1-inch squares
2 (6-inch) corn tortillas, cut into 1-inch squares
Guacamole or diced avocado (optional)