Beefy cheesy spaghetti bake

1 1/2lb hamburger
1/4 c onion
15 0z sauce ( paula-see my spaghetti sauce recipe)
6 oz spaghetti
2 T marg
4 tsp flour
1/4 tsp salt-or to taste. Paula likes more.
3/4 c evaporated milk
1/3 c water
1 c shredded american cheese
4 T parmesan cheese
2T dried parsley-looks great
{paula's optional: cream cheese or ricotta cheese}
Brown hamburger and onion.
Cook and drain spaghetti.
Add sauce and simmer 10 min.
Melt marg, add flour, salt, milk and water. Add pepper to taste. Simmer until thick stirring often. Add American cheese and parmasan cheese. Cook until melted. Stir into spaghetti. Stir in 2 t or so of dried parsley I add either cream cheese or ricotta cheese also-makes it creamy}
Layer meat mixture on bottom of pan, then spaghetti, then more meat mix. Cook -15-30min. Let stand for short time to thicken.
Works great to put into bread pans. Makes it taller.
Recipe from Cindy Osterloh from school.