1. Preheat a skillet over medium heat.
2. Spread butter on one side of each slice of bread.
3. Place two slices of bread, buttered side down, on the skillet.
4. Layer the mozzarella slices evenly on the bread in the skillet.
5. Add slices of tomato and avocado on top of the mozzarella.
6. Season with salt and pepper, and add fresh basil leaves if using.
7. Top with the remaining slices of bread, buttered side up.
8. Cook until the bottom slice is golden brown and the cheese begins to melt, about 3-4 minutes.
9. Carefully flip the sandwiches and cook the other side until golden brown and the cheese is fully melted, another 3-4 minutes.
10. Remove from the skillet, slice in half, and serve immediately.
Variations & Tips
For a more robust flavor, try adding a few slices of prosciutto or crispy bacon to the sandwich. If you prefer a bit of heat, consider adding a few slices of jalapeño or a sprinkle of red pepper flakes. For a gluten-free version, use your favorite gluten-free bread. You can also experiment with different cheeses, such as provolone or fontina, for a unique twist. To make it vegan, use a plant-based cheese and butter substitute.
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