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