Crack egg into the second breading tray. Whisk in water.
1 large egg, 2 Tablespoons water
Combine both types of bread crumbs, onion powder, Old Bay, and garlic salt in the third breading tray.
1/2 cup breadcrumbs, 1/2 cup panko breadcrumbs, 1 teaspoon onion powder, 1 teaspoon Old Bay seasoning, 1 teaspoon garlic salt
Cut filets into square pieces. For us, this meant cutting our 4 filets in half.
1.25 pounds cod fish filets
Dredge filets in flour, working with one or two at a time. Dredge both sides and gently shake off excess.
Place dredged filets into the egg wash and turn to coat both sides. Allow excess to drip off.
Put filets into the bread crumb mixture and gently press to adhere, repeat on other side. Move breaded filets to a baking sheet and repeat the process for remaining filets.
Allow filets to rest while the deep fryer is preheating. Add oil to deep fryer and preheat to 375 F.
oil for frying
When fryer is ready, place 2-3 filets into the basket of your deep fryer. You do not want them to be too crowded or they may stick together.
Drop basket carefully into hot oil and allow to cook, gently shaking basket occasionally so they don’t stick, for 5 minutes or until internal temperature reaches 145 F.
Place cooked filets on paper towels to drain while you cook the remaining filets.
Serve on slider buns with cheese and your choice of toppings.
We used cod filets we bought from the seafood counter. You can use any hearty white fish such as haddock, tilapia, pollock, or catfish for this recipe. If you buy frozen filets, be sure to thaw them first and drain on paper towels, then pat dry before frying.
You can use any cheese you like; we prefer American or cheddar. We cut each slice into 4 pieces and found them to be a bit small for these filets. Use however much you like. We suggest having the slices ready and adding them to the hot filets so they will melt a bit before assembling the sandwiches.
A good way to know when your fish is done cooking is to check it with an instant-read thermometer. Insert the thermometer into the thickest portion of the fish to test. The thermometer should reach an internal temperature of 145F when it is done cooking.