"Beatrice Ojakangas, The Best Casserole Book Ever..."
INGREDIENTS
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1 tablespoon butter, plus extra for the dish
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4 slices bacon
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8 green onions, thinly sliced (white and green parts)
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1 lb mushroom, sliced
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8 large eggs
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1 cup milk
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1 teaspoon salt
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1/8 teaspoon pepper
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2 1/2 cups shredded cheddar cheese