Beef Enchiladas with Homemade Enchilada Sauce

vegetable oil

yellow onion (diced)

garlic (minced)

lbs ground beef

salt and pepper

can diced green chiles (I used mild)

can black beans (rinsed and drained thoroughly)

flour tortillas

Mexican-blend shredded cheese

batch homemade red enchilada sauce (or 1 can store-bought enchilada sauce)

chopped fresh cilantro and green onions (for garnish)