• In a large skillet, saute mushrooms and onions in oil until tender. Place half of the bread cubes and 1/2 cup Swiss cheese in a greased 13-in. x 9-in. baking dish. Layer with bacon, cheddar cheese, mushroom mixture, spinach and remaining Swiss cheese and bread cubes.
• In a large bowl, combine the eggs, milk and seasonings. Pour over casserole. Cover and refrigerate overnight.
• Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 375° for 45-55 minutes or until a knife inserted near the center comes out clean (cover loosely with foil if top browns too quickly). Let stand for 10 minutes before cutting.
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