Put 2 slices of bread on a cutting board or work surface. Top each with two slices of cheese, the apple slices, a third slice of cheese and another piece of bread. Press down lightly.
Heat 1 tablespoon butter in a large skillet over medium-low heat. Add the sandwiches and cook until the bread toasts and the cheese is slightly melted, 3 to 5 minutes. Flip with a spatula and add the remaining tablespoon of butter to the pan. Cook until the other side is toasted and the cheese is melted, about 3 minutes more, adjusting the heat as needed to keep the bread from burning before the cheese melts.?
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