Crocked Tater Tot Soup Recipe

1 (32 ounce) package frozen bite-size potato nuggets (such as Tater Tots®)

2 cups milk

1 (10 ounce) can cream of mushroom soup

1 cup shredded Cheddar cheese

1 cup sour cream

1 cup chopped cooked ham

½ cup finely chopped onion

salt and ground black pepper to taste