Hamburger Steak with Onions and Gravy

1 1/3 pounds ground chuck
3/4 cup finely chopped onion
1 egg
1 tablespoon Worcestershire sauce
1 1/2 teaspoons seasoned salt, divided
3/4 teaspoon pepper, divided
1/2 teaspoon garlic powder
1/3 cup plus 1/4 cup flour
3 tablespoons vegetable oil
2 medium onions, thinly sliced
2 cups water
1/2 teaspoon salt

Combine first 4 ingredients with 1 teaspoon seasoned salt, 1/2 teaspoon pepper and garlic powder, mixing well; shape into 4- to 4 1/2-inch patties. Dredge well in 1/3 cup of the flour.

Heat oil in a large heavy skillet over medium-high heat, add patties, and cook until well browned on both sides. Remove from skillet and set aside. Add sliced onion to skillet; reduce heat to medium, and saut? until onion is browned.

Combine water, 1/4 cup flour, 1/2 teaspoon seasoned salt, salt and 1/4 teaspoon pepper; stir until smooth. Stir into skillet and cook, stirring constantly, until thickened. Return steaks to skillet, turning to coat with sauce. Cover, reduce heat, and simmer 15 minutes.