This is my favorite way to use them:
One sheet of puff pastry rolled thin
1/4 C of melted butter
Apple slices to cover
2 T marmalade thinned with 2 T of melted butter
Lay the puff pastry on a cookie sheet and brush some melted butter over it. Fold the edges in.
Lay out the apple slices so they overlap each other a bit. Spread the thinned marmalade over it and finish off with the rest of the butter.
Bake in a hot oven for 15 minutes or until golden. Slice and enjoy.