Preheat oven to 400 degrees F and line a rimmed baking sheet with a silicone baking mat.
Place flour and ranch seasoning mix onto a large shallow plate and whisk to combine.
Place eggs and lemon juice onto another large shallow plate and whisk until combined.
Place parmesan, garlic powder, salt, and pepper onto a third large shallow plate and whisk to combine.
Working with one filet at a time, season with a touch of salt and pepper, then fully coat the filet in the flour/ranch mixture, then whisked egg/lemon juice, and then parmesan mixture.
Place onto the prepared baking sheet, then repeat with remaining filets.
Spritz each filet with cooking spray, then bake in preheated oven for 8-10 minutes or until the fish easily flakes with a fork and the internal temperature reaches 145 degrees F.
Serve with lemon aioli and enjoy!
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