Au Gratin Potatoes - cooking recipe

Ingredients

3 Tbsp. margarine
3 Tbsp. flour
1 1/2 tsp. salt
1/4 tsp. pepper
3 c. milk
12 medium potatoes
1/4 c. chopped onions
2 c. shredded Cheddar cheese

Preparation

In 2-quart saucepan, over medium heat, melt margarine.
Stir in flour, salt and pepper until blended.
Continue cooking 2 minutes, stirring constantly.
Set aside.
Peel potatoes and slice thin.