Ham and Cheese Quiche

1 package of Pillsbury ready pie crust
1/2 chopped onion
8 beaten eggs
1/2 cup half-and-half
1/4 teaspoon each of salt and pepper
1 1/4 cups shredded cheddar cheese
8 slices of deli ham

Line a 9-inch pie plate with the pastry. Trim; crimp edges as desired. Line the unpricked pastry shell with a double thickness of foil. Bake in a 450 degree F oven for 8 minutes. Remove foil. Bake for 4 to 5 minutes more or until pastry is set and dry. Reduce oven temperature to 325 degrees F.
In a bowl stir together eggs, half-and-half, salt, pepper, cheese, and ham.
Pour egg mixture into the hot, baked pastry shell.
Bake in the 325 degree F oven for 45 to 50 minutes or until a knife inserted near the center comes out clean. If necessary, cover edge of crust with foil to prevent over browning. Let stand for 10 minutes before serving.