01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper and lightly grease or spray with oil.
02 - Cut the fish fillets into bite-sized cubes, approximately 1 inch in size.
03 - In a bowl, whisk together the lemon juice, olive oil, Dijon mustard, salt, and pepper. Add the fish cubes and toss gently to coat. Let marinate for 10 minutes.
04 - In a shallow dish, combine the panko breadcrumbs, Parmesan cheese, paprika, and dried parsley.
05 - Remove fish cubes from the marinade, allowing excess liquid to drip off. Roll each cube in the breadcrumb mixture, pressing gently to ensure adherence.
06 - Arrange the coated fish bites in a single layer on the prepared baking sheet.
07 - Lightly spray or drizzle olive oil over the bites to assist with crisping.
08 - Bake for 16 to 18 minutes, turning once halfway through, until golden brown and cooked through.
09 - Serve hot with lemon wedges or your favorite dipping sauce.