In med sauce pan, melt butter over medium heat. Add onion, salt and pepper.
Remove from heat, whisk in flour until smooth paste is formed. Then add milk and continue to cook until thick and bubbly. In greased dish layer 1/2 potatoes and 1/2 sauce mixture. Layer rest of potatoes and sauce. Bake 45 minutes in 375 oven covered. Uncover and bake another 30 minutes.
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