To make this I used the following rough measurements. I’m not a recipe guy, so adjust to your tastes:
Cut fillets into 2”x 6” strips removing any red meat
Dry the fish really well on paper towels
Heat your oil in a frying or deep sided pan.
In a large bowl combine:
1 cup of flour
1/3 cup corn starch (adds great crunch)
1 tsp Garlic Powder
1 tsp Onion Powder
1 tsp Smoked Paprika
1 tsp Baking Powder
1 tsp Baking Soda
Salt and Pepper
1 beer of your choice. Cheap beer is just fine for this

The batter should be thick like pancake batter, add flour if it’s runny or add water if too thick

Dry the fillet sections again, (important step), and dredge in the batter and coat.
Take a drop of batter and test your oil. It should sizzle and begin cooking.

Once the oil is hot, add the fish sections to the oil. Don’t overcrowd the pan.
Cook until golden brown and flip to the other side.
Once cooked, transfer to a wire cooling rack with paper towels under it to drain. You want the rack to keep the crisp crust. Paper towels will steam the crust and make them soggy.
Add salt while still hot

Enjoy with some homemade tarter sauce or malt vinegar