1Combine swiss cheese and parmesan cheese in a small bowl; set aside.
Melt butter in a small skillet and saute onions until tender; set aside.
2In a 10 inch quiche dish, alternate layers of potatoes,onions and cheeses.
In a small mixing bowl, combine half and half, egg yolks, whole eggs, salt, pepper and nutmeg. Beat lightly to combine. Pour over stacked potato mixture.
3Cover with foil which has been sprayed with cooking oil. Bake 350 degrees for 1 1/2 hours, or until potatoes are tender. Remove foil cover. Bake until top is light golden brown. Remove from oven; cool for 30 minutes before cutting into pie-shaped wedges.
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