2 slices thick-cut bacon
1/4 tsp. smoked Spanish paprika
1 egg yolk
4 oz. American cheese, chopped
4 oz. cheddar cheese, shredded
3/4 cup whole milk
2 tbsp. all-purpose flour
1/4 cup freshly grated Parmigiano-Reggiano cheese
1 1/2 tbsp. unsalted butter
2 tbsp. elbow macaroni