01 - Set oven to 400°F. Line a baking sheet with parchment paper and lightly grease or spray it.
02 - Slice fish into bite-sized cubes approximately 1 inch in size.
03 - Whisk lemon juice, olive oil, Dijon mustard, salt, and black pepper together. Gently toss fish cubes in marinade and let rest for 10 minutes.
04 - Combine panko breadcrumbs, Parmesan, paprika, and dried parsley in a shallow dish.
05 - Remove fish from marinade allowing excess liquid to drip off. Roll each cube in breadcrumb mixture, pressing to adhere.
06 - Place coated fish cubes evenly spaced on the prepared baking sheet.
07 - Lightly spray or drizzle olive oil over the fish bites to encourage crispness.
08 - Bake for 16 to 18 minutes, turning once halfway through until golden and fully cooked.
09 - Present immediately with lemon wedges or preferred dipping sauce.