On a lightly floured waxed paper, roll dough into a 13X9 inch rectangle. Place dough, paper side up, over and 11X7 inch baking pan or dish. Remove and discard paper. Fit pastry into pan, gently pressing dough in to completely cove3r bottom and sides of pan. Trim off excess pastry. Sprinkle mushrooms and cheese on the pastry. Beat remaining ingredients together until well blended, and pour into pastry.
Bake in a preheated oven (375 degrees for a metal pan or 350 degrees for a glass dish) until a knife inserted halfway between center and outside edge comes out clean, 25-30 minutes. Let stand at least 5 minutes before serving. Serve hot or cold.
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