In a large bowl combine your ground chicken, 2 teaspoons salt, 2 teaspoons garlic powder and ¼ teaspoon onion powder.
Form into 4 oblong patties.
Place on a parchment lined tray and freeze for at least 1 hour.
In a bowl or shallow dish add your flour.
In another bowl or shallow dish whisk together the egg and water.
In another bowl or shallow dish whisk together your panko breadcrumbs, black pepper and paprika.
In a large deep skillet heat about an inch of oil over medium high heat.
Dredge the frozen chicken patties in the flour, then egg, then in the panko.
Working 2 at a time, fry the chicken patties in oil about 2-3 minutes per side, flipping once. Make sure the patties are 165 degrees on a meat thermometer.
Set aside on a wire rack to drain.
In a clean skillet over medium heat melt the butter and place the buns in the pan until lightly golden.
Assemble the sandwiches by spreading mayonnaise on the buns, adding a chicken patty and shredded lettuce.
Serve!