Easy Enchilada Skillet with Beef or Chicken

shredded, cooked chicken ((rotisserie chicken works well))

ground beef (cooked and drained)

medium onion (chopped)

canned black beans (rinsed and drained)

corn tortillas (torn into bite-sized pieces)

canned diced tomatoes & green chilies (undrained (use mild or hot))

red enchilada sauce

canned tomato sauce

shredded cheddar or Monterey Jack cheese (divided)

salt and pepper (to taste)

green onions (sliced (for garnish))