1-Gather and prepare all ingredients, including slicing the avocado, tomatoes, and mozzarella cheese to even thickness.

2-Preheat a non-stick skillet or griddle over medium heat to ensure even cooking.

3-Lightly brush one side of each bread slice with the softened unsalted butter for a crisp, golden crust.

4-On one slice of bread, layer two slices of mozzarella cheese, then add the tomato slices, followed by the third mozzarella slice.

5-Top with the second bread slice and place the sandwich buttered side down in the heated skillet.

6-Cook for 3 to 4 minutes per side until the crust is golden and the cheese melts, then spread the remaining butter on the top slice during cooking.

7-Remove from heat and serve immediately for the best flavor and texture.