Preheat oven to 400 degrees.
Cut the side cheeks off apples then discard the cores.
Using a sharp knife, cut each apple cheek into thin, equally-sized apple slices. Keep slices together to maintain their cheek shape.
Remove tart pan from the freezer.
Arrange sliced apples onto the crust, one cheek at a time, until the tart pan is completely filled with apples.
Sprinkle granulated sugar onto apple slices.
Top apples with cubes of butter.
Sprinkle tart with cinnamon.
Bake approximately 35 minutes or until the apple slices are tender and the crust is golden brown.
Remove tart from oven and cool on a baking rack.
Slice and serve.
Cover and store leftovers in the refrigerator up to 3 days