From Southern Living magazine
Print PDF of recipe here.
1/2 cup mayonnaise
2 tablespoons all-purpose flour
1/2 teaspoon salt
1/8 teaspoon pepper
1-1/2 cups milk
1 cup shredded sharp Cheddar cheese
1 teaspoon chopped fresh parsley
1 teaspoon chopped fresh chives
1 teaspoon chopped fresh thyme
4 cups (3 lb.) thinly sliced baking potatoes (about 4 large)
2 tablespoons grated Parmesan cheese
Combine 1/2 cup mayonnaise and next 3 ingredients in a saucepan. Gradually add milk, and cook, stirring constantly, over medium-low heat 8 to 10 minutes or until thickened. Remove from heat. Add Cheddar cheese and next 3 ingredients, stirring until cheese melts and is well blended.
Place half of potato slices evenly in a lightly greased 11- x 7-inch baking dish; pour half of cheese mixture over potatoes. Repeat layers with remaining half of potato slices and cheese mixture. Sprinkle evenly with Parmesan cheese.
Bake, covered, at 350 for 1 hour. Uncover and bake 30 more minutes or until potatoes are golden brown and fork tender.