INGREDIENTS
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1/4 cup toasted breadcrumbs (optional)
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1/4 pound ditalini, which are essentially mini macaroni shapes, or other small, similarly shaped pasta
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1 tablespoon unsalted butter, plus more for the tins
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1 tablespoon all-purpose flour
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1/3 cup whole milk, warmed
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2 ounces sharp Cheddar, grated
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2 ounces Gruyère, grated
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1 large egg yolk
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1 tablespoon heavy cream
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1 teaspoon Dijon mustard (optional)
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Salt and freshly ground black pepper to taste