Take 1 taco shell and cut out a circle. Brush it with melted butter. Sprinkle with granulated sugar. Put it between 2 cookie sheets and bake at 275 degrees for about 15 minutes.
Cover an oven proof plate with tightly secured plastic wrap. Brush generously with melted butter. Peel the apple and core it. Thinly slice the apple with a mandoline. Fan out the slices on the plastic wrap so it is the same size as the cut taco shell circle. Brush the apple with melted butter. Sprinkle with granulated sugar. Bake at 360 degrees for about 10 minutes. Let it cool, but not completely. Slide the apple over the taco shell making sure it keeps its shape. Serve.