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Preheat oven to 375 degrees F.
Grease a small casserole dish with a cover.
Peel and slice 1 potato into thin slices. Arrange on bottom of casserole dish. Season with garlic salt.
Add about 1/3 of sliced mushrooms over top. Grate about 1/3 of cheddar over potatoes. Spoon a few spoonfuls of Cream of Mushroom soup over cheese and spread out.
Repeat for one or two more layers until ingredients are used up.
Cover and bake for 1 hour at 375 degrees F. Let rest for 5 min.
Jun 2010