Ingredient substitutions: Swap turkey for chicken or roast beef for a different twist. You can also use Swiss cheese if you prefer its mild flavor. Add sliced tomatoes or avocado for extra freshness. For a spicy kick, try adding jalapeños or a dash of hot sauce. If you have leftovers, wrap the sandwich tight and store it in the fridge for up to 2 days. Reheat in a skillet on low heat to restore that crispy texture.