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Export 8 ingredients for grocery delivery
Step 1
Preheat oven to 400°F.
Step 2
Wash potatoes and slice into ⅛" thin slices. Slice onion as thin as possible.
Step 3
Layer potatoes and onions in little stacks. Place stacks upright in a greased casserole 2.5qt to 3qt dish.
Step 4
Melt butter & flour in a saucepan and cook 2-3 minutes. Add seasonings and milk. Whisk over medium heat until thick and bubbly. Remove from heat and stir in cheeses until melted.
Step 5
Spoon cheese sauce over potatoes. Cover with foil (sprayed with cooking spray) and bake 60 minutes.
Step 6
Remove foil and bake an additional 20-30 minutes or until lightly browned and potatoes are cooked. Cool 15 minutes before serving.