Preheat the oven to 400 degrees. Line a baking sheet with a Silpat mat and coat it with olive oil cooking spray.
Make a dredging station by placing the flour on a shallow plate, and season with garlic powder, sea salt, and freshly cracked pepper to taste.
Combine the milk and egg in a small bowl and season with garlic powder, sea salt, and freshly cracked pepper to taste. Whisk until well combined.
Place the panko on a shallow plate and add the lemon zest, fresh dill, garlic powder, sea salt, and freshly cracked pepper to taste; mix until well combined.
Cut the fish into strips.
Dredge the fish by coating each piece of the fish in the flour, then dip it into the egg mixture, followed by the panko crumbs.
Place the coated fish on the baking sheet. Repeat with the remaining fish.
Spray all the fish with a bit of olive oil cooking spray.
Bake the fish sticks by placing them in the oven and baking for 10 minutes or until the fish is cooked through and flaky.
Turn the oven to broil, then cook, watching very carefully so they don't burn, for a few minutes to get golden brown on top.
Serve with the cucumber dill sauce on the side, if desired, along with lemon wedges. Enjoy.