Preparation:
Take a greased baking dish and layer the potatoes and onions in it. Then, melt some butter in a saucepan and stir some amount of flour in it. Let this mixture smoothen and once it does, you can add the broth very slowly to this. Add some mayonnaise, salt, and pepper. Cook this preparation till it turns thick and stir the mixture for around 2 minutes. Then, pour this mixture over the potatoes. Gently sprinkle some amount of paprika over it. Cover the preparation and bake it at 325° F, for 2 hours. Serve it hot.