Potatoes au gratin are actually really easy to master. What's the difference between potatoes au gratin and scalloped potatoes? Gratins have cheese; scalloped potatoes do not...unless they're Loaded Scalloped Potatoes with cheddar and bacon. The foil helps cook the potatoes (they kinda steam and boil in the sauce) while the whole gratin is in the oven. To help prevent that you can lay your sliced potatoes out on paper towels to help soak up some excess water.
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