"In 'The Best Casserole Cookbook Ever' by Beatrice Ojakangas..."
INGREDIENTS
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6 tablespoons butter, at room temperature
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6 slices thick-cut bread, crusts trimmed
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1/2 teaspoon pepper
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1/2 cup shredded swiss cheese
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1/2 cup shredded sharp cheddar cheese
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1/2 cup shredded manchego cheese
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1 1/2 cups whole milk
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6 large eggs
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2 teaspoons fresh oregano leaves (or 1/2 t. dried)