You can make gluten-free breaded fish filets by spreading mayonnaise and rolling in crushed potato chips and baking.
Cooks Illustrated recipe IIRC.
Or you can just skip the breading and cook them another way.
I love the fish with potato chip idea. Our guest is from Japan. She has discovered that she Loves kettle cooked style potato chips. She says she is bringing a bag home as a souvenir.
I made a beef milanese once using instant mashed potato flakes in place of the breading. The cooking aroma was heavenly and it tasted good, too.