Ingredients

1 large onion, chopped
3 Tablespoon butter
3 Tablespoon flour
1/2 Teaspoon salt
1/4 Teaspoon black pepper
3/4 Teaspoon dry mustard
1 1/2 Cup milk
3/4 Cup mayonnaise
10 medium potatoes
1 1/2 Cup Velveeta cheese, shredded

Instructions

Boil potatoes with skins on. Peel and slice. Chop onion and add to potatoes. Mix together remaining ingredients except mayonnaise and Velveeta cheese and bring to a boil. Cook for 1 minute. Blend in mayonnaise. Pour mixture over potatoes and mix well. Place potatoes in baking dish. Cover potatoes with Velveeta cheese. Cover pan and bake at 350 degrees for 40 minutes. Remove foil the last 10-15 minutes to allow top to brown slightly.

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