Cut cube steak into four even pieces (about the size of the bun); pat dry and let come to room temperature.
Add oil to a large cast iron skillet and place over medium-high heat until oil reaches 350°F.
Add egg and milk to a bowl and beat together until mixed well. Add flour, seasoned salt, and black pepper to a separate bowl and mix until well combined.
Dredge each steak piece in flour mixture on both sides, then dip into milk, then back into flour, coating both sides. Repeat with remaining steaks.
Carefully add floured steaks into hot oil. Cook for 3-4 minutes on each side or until well browned. Transfer to a paper towel lined plate to drain.
Place a piece of chicken fried steak on each bottom bun and top with lettuce and country gravy (or chipotle mayo). Top with top buns. Serve immediately.
Recipe adapted from: www.missinthekitchen.com