To this, add the butter and flour and mix until combined.
Slowly add in the milk, mixing constantly to avoid any flour from lumping up.
Once all of the milk is added in, add in the grated cheese and chopped boiled egg. Mix well. Loosen this mixture with a splash of the pasta water in order to reach the desired consistency.
To this mixture, add in the nutmeg, paprika, and salt and pepper to taste.
Combine the cooked pasta with the cheese sauce and mix well.
Pour the pasta and sauce mixture into an oven safe dish and top with grated potatoes.
Broil for 5 minutes until potatoes are golden brown and the cheese sauce is bubbling.
Top the dish with the remaining boiled egg and a few pieces of crispy bacon. (optional)
Notes
Be sure to take care when taking the dish out of the oven and even while serving as it the contents will be incredibly hot.