You can fill them with anything. Had an awesome batch a while back with sharp cheddar and breakfast sausage. Other good fillings, smoked salmon, shrimp, little smokies, do a play on a cheeseburger (hamburger, diced onion, little cheddar or pepper jack, squirt of mustard and ketchup) or taco (taxi seasoned beef, black beans, three cheese blend, diced tomato and onion). Use Queso fresco, blue cheese, ohh how about a pizza ABT (marinera, pepperoni, mozzarella). Another favorite is pulled pork or steak and cheese. Oh the list could go on and on and on.