Saute onion in a little butter or olive oil. Sprinkle on the bottom of the pie shell along with the ham. Cover with the grated cheese. Mix the egg with the sour cream, milk, and seasonings and pour over the cheese and ham. Bake at 375 F for about a half an hour or until a sharp clean knife inserted in the center comes out clean.
Quiches freeze well before baking.
Vary the ingredients on the bottom to customize your quiche.