In a bowl, whisk egg whites with 2 tbsp of water. In another bowl, whisk ½ cup flour, garlic powder, salt, and pepper.
Dip the steak into buttermilk, then into egg whites and lastly, dip the steak into flour mixture. Do the same with all steaks.
In a large skillet (nonstick), heat 2 tbsp of oil on medium-high heat. Add steaks to the skillet, cook for 3 to 4 minutes per side. Transfer them to a paper-lined plate.
Add 1 tbsp of remaining oil to the skillet, add onion and cook until soft. Add 1 tbsp of all-purpose flour and stir for 1 minute. Slowly addchicken broth and milk. Simmer the gravy for 2 minutes until thick.
Transfer the steaks to the serving plate and pour the gravy over the top of the steaks and serve.