In a shallow bowl, combine 1-3/4 cups flour, baking powder and seasonings. In another shallow bowl, combine egg and 3/4 cup buttermilk. Dip each cube steak in buttermilk mixture, then roll in flour mixture. Let stand for 5 minutes., In a large cast-iron or other heavy skillet, heat 1/2 in. of oil on medium-high. Fry steaks for 5-7 minutes. Turn carefully; cook until coating is crisp and meat is no longer pink, about 5 minutes longer. Remove steaks and keep warm., Drain, reserving 1/3 cup drippings; stir remaining flour into drippings until smooth. Cook and stir over medium heat for 2 minutes. Gradually whisk in milk and remaining buttermilk. Bring to a boil; cook and stir until thickened, 2 minutes. Serve with steaks.