Heat oven to 375°F.
If using crescent rolls: Unroll dough; separate into 4 rectangles. Firmly press perforations to seal. On ungreased cookie sheet, press or roll each to form 7x5-inch rectangle. If using dough sheet: Unroll dough; cut into 4 rectangles. On ungreased cookie sheet, press or roll each to form 7x5 inch rectangle.
Place one ham slice and one cheese slice on each rectangle. For each rectangle, fold dough in half over filling; press edges firmly to seal.
Bake 10 to 13 minutes or until golden brown.