For the best texture, choose sturdy bread like sourdough, brioche, or Texas toast. Fill it with your favorite cheese — sharp cheddar for boldness, mozzarella for stretch, or a mix like cheddar and gouda for depth. Spread mayo on the outside slices, then cook in a skillet over medium-low heat until each side turns golden. Let it rest for a minute before cutting so the cheese settles nicely inside.

To take it to the next level, you can add caramelized onions, fresh tomato slices, herbs like basil, or even a hint of hot sauce mixed into the mayo. This mayo swap creates the ideal balance of crunchy, creamy, and flavorful in every bite. After trying this method, you may never return to butter — it’s simple, delicious, and guaranteed to satisfy.