Hearty Hamburger Green Bean Casserole

Ingredients:

1 pound ground beef

1 (15 ounce) can green beans, drained

1 (10.5 ounce) can cream of mushroom soup

1/2 cup milk

1/2 teaspoon black pepper

1 cup shredded cheddar cheese, divided

1 (2.8 ounce) can crispy fried onions, divided