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Export 7 ingredients for grocery delivery
Peel the potatoes, then using a mandolin, or sharp knife - do a medium slice on your potatoes. They should be between a quarter and a half inch thick).
Slice the onions thinly.
Grease an 8 x 8 baking dish, and preheat the oven to 350F.
Layer the potatoes, onions, flour, salt and pepper, about 3 times. On the last layer - add the butter.
Heat the milk til it's hot, but not boiling.
Pour the milk over the top of the dish.
Top with cheese.
Bake until potatoes are tender (about 50 minutes).
Uncover and bake until top browns
Remove from the oven, and let it stand while the sauce thickens.
Devour (and hide the leftovers for yourself).