Cut beef into 4-6 equal sized pieces.
Using a meat mallet, pound each piece of beef to ¼ inch thickness.
Preheat a cast iron skillet over medium heat. When skillet is hot add vegetable oil.
While skillet is preheating, whisk together egg whites with a tablespoon of water in a shallow bowl. Set aside.
In another shallow bowl combine, 1 cup of the flour, salt, pepper, garlic powder, onion powder, parsley flakes, mustard powder, and paprika. Set aside.
Place one piece of beef in the egg white to coat.
Then place in the flour mixture, pressing the beef into flour to coat it completely.
Place coated steak in the hot skillet. Continue with remaining cube steaks.
Cook steaks until coating is a rich golden brown color.
Remove steaks from the skillet and drain on a plate lined with paper towels. Keep warm.
Pour off any excess oil from the skillet.
Add a pat of butter and diced yellow onions to the skillet. Cook until onions are soft, stirring often to prevent them from burning, about 4-5 minutes.
Stir in 3-4 rounded tablespoons of seasoned flour.
Slowly add milk and adobo seasoning. Stir until you have a smooth gravy and no lumps remain. If gravy gets too thick, thin with more milk or water if needed.
Serve chicken fried steaks over a bed of mashed potatoes and cover with gravy.
Top with a sprinkle of green onions to serve.