Step 1

In a large pot of salted water, cook the pasta al dente according to the package instructions. Drain, toss with some butter or oil, and set aside.

Step 2

In a large pot, melt butter and add flour. Mix well and cook for 1 min.

Step 3

While constantly whisking, gradually add the milk.

Step 4

Simmer for about 5 mins until the sauce has thickened.

Step 5

Whisk in the egg, if using. Optional: only add the egg yolk. Beat the egg white stiff and gently fold it.

Step 6

Season with nutmeg, salt, and black pepper.

Step 7

Place the pasta in a large baking dish.

Step 8

Add diced ham and pour the white sauce over the pasta. Distribute evenly.

Step 9

First, sprinkle the grated cheese, then the breadcrumbs over the dish. Place dollops of butter on top.

Step 10

Bake in a preheated oven at 400˚F for about 20 mins or until golden-brown.