Egyptian Light Creamy Baked Béchamel Pasta (greek Pastitsio)

"Baked béchamel pasta the most popular dish of every occasion in Egypt. This dish is made of layers of penne pasta and juicy minced beef smothered in a creamy béchamel sauce. It is quite similar to the Greek Pastitsio, with the only difference in the shape of the used pasta. I have prepared an incredible skinny version which you can’t differentiate from the traditional one. It takes around 90 minutes to prepare. This recipe yields 8 servings, with around 393Kcal/serving."