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Butter two shallow 3-quart (9 x 13) baking dishes.
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Spread bread over bottom and drizzle with butter.
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Sprinkle with Swiss and Jack cheeses and salami.
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Beat together eggs, milk, wine, green onion, mustard pepper and red pepper until foamy. Pour over cheese.
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Cover dishes with foil, crimping edges. Refrigerate overnight or up to 24 hours.
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Remove from, refrigerator about 30 minutes before baking.
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Preheat oven to 325 °F.
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Bake casseroles covered until set, about 1 hour.
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Uncover; spread with sour cream and sprinkle with remaining cheese. Bake uncovered until crusty and lightly browned; about 10 minutes.