Heat oven to 350. Wash 2 lbs or 6 medium potatoes and peel them. Cut into thin slices and place in greased 2 quart casserole dish with a 1/4 cup finely chopped onions. Melt 3 TBSP butter over low heat, blending in 3 TBSP flour, and salt and pepper to taste until mixture is smooth and bubbly. Stir in 2 1/2 cups of milk and bring to a boil, stirring constantly for 1 minute. Pour over potatoes. Cover and bake for 30 minutes and then bake uncovered for 30 – 45 minutes longer, or until tender.
REVIEW: Excellent taste, but needs quite a bit of salt and pepper. The sauce is perfect! Love the thickness! Browned just perfectly. Only downside -- baked them for a little over an hour and the top potatoes weren't quite as soft as we like them. The lower layer of potatoes was perfect... so, just a little more time is the ticket here. Thanks Kathy!