Preheat your oven to 425°F (220°C).
Peel and cut the sweet potato into fry-shaped sticks. Toss them with olive oil, salt, and pepper, and spread them evenly on a baking sheet.
Place the sweet potato fries in the oven and roast for 20-25 minutes, turning halfway, until tender and edges are slightly crispy.
Meanwhile, pat the cod fillet dry with paper towels. Season both sides lightly with salt and pepper.
In a shallow dish, combine the egg white and in another plate spread out the panko breadcrumbs. Dip the cod fillet first in the egg white ensuring a light coating then dredge in the breadcrumbs, pressing slightly to adhere.
Place the breaded cod on a lightly greased or parchment-lined baking sheet.
Bake the cod in the preheated oven for 12-15 minutes, or until the fish flakes easily with a fork and the coating is crisp golden.
Squeeze a lemon wedge over the cod fillet just before serving for a fresh burst of flavor.
Plate the crispy baked cod alongside the roasted sweet potato fries and enjoy your balanced, delicious meal.