Vegan Pastitsio request with bchamel comparison

INGREDIENTS (For 4 people)

For the bchamel sauce:
4 tbsp vegan butter
4 tbsp flour
2 cups vegan milk (not sweetened)
1 tsp nutmeg
Salt, pepper
1 tbsp vegan egg (optional)
1 cup vegan cheese

OR watch the vegan corner's recipe: https://www.youtube.com/watch?v=9GgKCbfWpJI

For the "minced meat"
1/2 cup olive oil
1 dry onion
2 cups vegan minced "meat"
2 cups tomato sauce
Salt, pepper
Basil (optional)

For the pasta
1/2 kg (1 lb) of any hollow pasta of your preference