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Top-ranked recipe named "New Mexican Potatoes Au Gratin"
In saucepan, melt butter over medium high heat. Add flour and stir into butter. Let cook and brown slightly, forming a thick roux. Stir in sour cream, green chiles, salt and pepper. Let thicken to the consistency of thick gravy (add a milk 1 T. at a time if you need to thin it a bit). Remove from heat and add most of the cheese; set aside. Slice unpeeled potatoes into 1/4" thick slices. Place one layer in small casserole, and pour half the cheese sauce over; layer again and pour again. Bake at 350 degrees for 45 min. - 1 hr. Top with whats left of the cheese and bake an addition 15 min. Karen Baldwin, Intergraph