Vegetarian Mexican Casserole

Name: Vegetarian Mexican Casserole
Prep time: 1 h
Cook time: 1 h 30 min
Total time: 2 h 30 min
Yield: 20 serving(s)
Ingredients: 8 cups brown rice; 24 zucchini; 24 summer squash; 2 -20 ounces black beans; 16 ounces frozen mixed vegetables; 2 -16 ounces frozen onions; 2 large green peppers, diced; 8 cups cheddar cheese; 2 tablespoons garlic powder; 2 tablespoons onion powder; 4 tablespoons taco seasoning; 48 ounces salsa