INGREDIENTS
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2 tablespoon butter, at room temperature
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8 sandwich-size slices pain au levain (or use sourdough bread)
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4 ounces Fromage blanc cream cheese (you can substitute Greek yogurt)
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4 ounces Gruyre cheese, coarsely grated (or use Swiss)
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4 ounces cheddar cheese, coarsely grated
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4 ounces Havarti cheese, coarsely grated