INGREDIENTS
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2 to 3 slices rustic bread, such as ciabatta, trimmed of crusts and cut into 1-inch pieces
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1 tablespoon unsalted butter
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Coarse salt and freshly ground pepper
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1 pound spaghetti
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3 large eggs, room temperature
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1 ounce Parmesan, finely grated (about 1/2 cup)
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1 ounce sharp cheddar, finely grated (about 1/2 cup)
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1/2 cup heavy cream
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1/2 teaspoon Dijon mustard