The best Au Gratin Potato recipe ever! Made this last night and LOVED it! Like other reviewers, I medium diced the onion and used 1 1/2 times the sauce recipe. I doubled the cheese to 3 cups. I also added 2 tsp. of dry mustard powder to the sauce. I used about 2 pounds of potatoes, and a 9X13 well-buttered baking dish, since the increased sauce would mean it wouldn't fit into a one quart pan. I baked it, covered with foil for one hour at 375 and then uncovered it for another 20-30 minutes. It browned really nicely. Planning to make this again for a family Easter dinner next week! Perfection!
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The best Au Gratin Potato recipe ever! Made this last night and LOVED it! Like other...