01 -
Whisk eggs with all-purpose flour, garlic powder, 1/2 teaspoon kosher salt, and 1/4 teaspoon black pepper in a shallow bowl until smooth. Place panko breadcrumbs in a separate shallow dish.
02 -
Pat fish fillets thoroughly dry with paper towels. Season both sides evenly with kosher salt and freshly ground black pepper. Dip each fillet into the egg-flour mixture to coat completely, then press into panko breadcrumbs for an even crust.
03 -
Pour peanut or vegetable oil into a heavy skillet to a depth of 1/4 inch. Heat over medium until shimmering, and a breadcrumb sizzles when dropped in.
04 -
Working in batches, fry the breaded fish fillets, turning once halfway, until golden brown and just cooked through, about 2 to 3 minutes per side. Transfer to a paper towel-lined plate and immediately sprinkle lightly with salt.
05 -
Place a slice of American cheese on the bottom of each toasted potato bun. Set a hot fried fish fillet on top of the cheese. Spoon a generous amount of tartar sauce over the fillet, then cap with the top bun. Serve immediately, with extra tartar sauce on the side if desired.