You might be fooled into thinking you are eating plain meatballs until you cut them and see a creamy cheese and bacon filling. Make these for everyday and company meals as well as potlucks. Use them to top off spaghetti and fettuccine and sometimes even shape them into patties. Good with garden fresh chives and parsley sprinkled into the beef. Mozzarella and Swiss cheese are good substitutes for the cheddar. Try ground turkey instead of beef.