1 butternut squash, peeled and cut into 1/2-inch cubes
1 medium onion, chopped
4 cloves garlic, minced
1 red bell pepper, chopped
1 tablespoon mild chili powder
1 1/4 teaspoons ground cumin
2 teaspoons Mexican oregano
1/8-1/4 teaspoon chipotle chili powder (or to taste)
2 15-ounce cans diced tomatoes
1/2 cup water
salt and freshly ground black pepper, to taste
2 15-ounce cans beans (see note above), drained
3 green onion, sliced (for garnish)