Line unpricked pastry shell with a double thickness of heavy duty foil. Bake at 450 degrees F for 8 minutes. Remove foil, bake 5 minutes longer. Cool on a wire rack. Reduce heat to 350 degrees F.
In a large skillet, saute the onion, mushrooms, squash, and garlic in butter until tender. Add spinach, saute 1 minute longer. Spoon into crust and top with cheese.
In a bowl, whisk the eggs, cream, salt, rosemary, and pepper until blended. Pour over cheese. Cover edges of crust loosely with foil.
Bake for 40-45 minutes or until a knife inserted near the center comes out clean. Let stand for 10 minutes before cutting.
By Robin from Washington, IA
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