Zucchini and Corn Green Chicken Chili

Name: Zucchini and Corn Green Chicken Chili
Ingredients: 1 tablespoon oil (or bacon grease); 1 onion, diced; 1 jalapeno pepper, diced (optional); 3 cloves garlic, chopped; 1 tablespoon ground cumin; 3 cups chicken broth (link) (or vegetable broth (link)); 2 cups salsa verde (link); 1 pound boneless and skinless chicken breasts or thighs; 2 (15.5 ounce) cans white beans, rinsed and drained; 1 teaspoon oregano; 1 medium zucchini, sliced (optional); 1 cup corn (fresh or frozen) (optional); salt and pepper to taste; 1 tablespoon cilantro, chopped (optional)