Tasty Tuesday; Potatoes Au Gratin

Yes.. another potato recipe. If you like "funeral potatoes" you will love these.
I may, or may not.. make a huge batch on Sundays and eat it throughout the week.
This was in my Mother-in-law, Sheila's recipe book made by my sister-in-law Kristin..who got it from her Aunt Barbara..get it?

Ingredients
5 TBSP margarine
6 TBSP chopped onions
7 TBSP flour
2 tsp salt
dash of pepper
3 c of milk
8 large potatoes (boiled with skins on)
4 c grated cheese

Melt butter in saucepan. Add onion and cook slowly for 5 minutes. Blend in flour; remove from heat. Add salt and pepper and stir in milk. Cook slowly, stirring until thick. Add cheese, reserving some cheese for the topping. Stir until the cheese is melted. Grease a baking dish. Peel potatoes and slice. Layer potatoes (I usually do 2 layers) and sauce. Top with grated cheese. Bake at 350 degrees for 20 minutes or until bubbly.

Super Yummy! What's your favorite potato recipe?