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Preheat the oven to 375 degrees F (190 degrees C). Grease a casserole dish.
Arrange sliced potatoes in the casserole dish; season with salt.
Melt butter in a saucepan over medium heat. Stir in flour until a paste forms. Pour in milk gradually, stirring constantly, until a thick white sauce forms, about 5 minutes. Stir in cheese and remove from heat. Pour sauce over the potatoes.
Bake in the preheated oven until potatoes are cooked through and tops are lightly browned, about 1 hour.