Absolutely! There are tons of opportunities to change up the filling for this recipe. You could use different spices on the beef, and add in vegetables like sweet onion, green peppers, peas, corn, etc. Get creative with it! If you want a little heat to it, feel free to add some hot sauce! For a fun twist, you could do a version with more Latin flair and use taco spice flavorings with cumin powder and chili powder, and cheddar cheese.