Step 1: Slice the avocado into thin wedges and cut the tomatoes into even rounds. Pat the mozzarella dry with a paper towel so your sandwich doesn’t turn soggy. Spread butter on the outer sides of all bread slices.

Step 2: Lay four slices of bread butter-side down. Layer with mozzarella, tomato slices, avocado, and a sprinkle of salt and pepper. Add basil leaves if you want a fresh, herby touch. Top with the remaining bread slices, buttered side facing out.

Step 3: Heat a skillet or griddle over medium heat. Place the sandwiches on the pan and cook for 3–4 minutes per side, pressing gently with a spatula. The bread should turn golden and crisp while the mozzarella melts beautifully inside.

Step 4: Let the sandwiches rest for about a minute before slicing in half. This quick pause helps the cheese set slightly and keeps everything from spilling out. Serve warm, maybe with a bowl of soup, some chips, or a light salad.