INGREDIENTS
1/4 lb
thick bacon slices, diced (about 4 slices)
2
medium leeks, cut into 1/2-inch rounds (about 1 cup)
1/3 16 ounce package
uncooked cavatappi pasta
1 1/2 tbsp
unsalted butter
1 1/2 tbsp
all-purpose flour
1 cup
milk, warmed
1/2 tsp
dry mustard
1/4 tsp
salt
1/4 tsp
ground black pepper
ground red pepper
1 cup
freshly grated 2-year-old aged Cheddar cheese, divided
1
egg yolk
1/2 cup
freshly grated Gruyère cheese
2 tbsp
heavy cream
1/4 cup
toasted soft, fresh breadcrumbs