Combine mayonnaise, flour, salt and ... thickened. Add cheddar cheese and stir until melted. Place ... and sprinkle with Parmesan. Bake at 350 degrees for 55 to 60 minutes.
Bake potatoes until thoroughly done; ... lengthwise, carefully remove potato from skins (save skins). Put ... butter, 1/3 cup Parmesan, and 1 teaspoon salt; ... place 1/3 slice cheese on each potato half. Return to oven until cheese melts.
Peel potatoes and remove dark ... pepper, butter, cheddar cheese and remaining boiling water. Simmer 10 minutes. Add Parmesan cheese just before serving. Makes 6 to 8 servings.