Scalloped Potatoes - With poultry

2 tablespoons cooking oil salt and pepper (optional) 3 tablespoons butter 3 tablespoons flour 1 1/2 teaspoons salt 1/2 teaspoon black pepper 2 teaspoons[...]

1 (5 ounce) package scalloped potatoes mix 1/8 teaspoon poultry seasoning 1 3/4 cups boiling water 1 (10 3/4 ounce) can condensed cream of chicken soup,[...]

5 thinly sliced potatoes 2 tablespoons chopped onions 3 tablespoons butter 1/4 cup flour 1 (14 1/2 ounce) can chicken broth 1/4 cup mayonnaise 3/4 teaspoon[...]