Cheesy Scalloped Potatoes - cooking recipe

Ingredients

8 to 10 large potatoes, peeled, sliced thin
1/2 c. margarine
1/2 c. flour
3 c. milk
salt
pepper
1/2 c. diced onion
2 c. finely shredded mild Cheddar cheese

Preparation

Place potatoes in crock-pot (only fill 2/3 full).
In saucepan, melt butter; add onion.
Steam until clear, then add flour stirring constantly on medium heat.
Add milk and simmer until sauce begins to thicken; remove from heat.
Add 1 1/2 cups of cheese.
Cook on low 14 to 16 hours.
Best when done the night before.
Place remainder of cheese on top.
Serve when melted.