Healthy Sheet Pan Cod with Roasted Carrots and Potatoes

Position your oven rack in the center and preheat to 425°F (220°C). This high temperature is crucial for creating crispy potato edges and properly cooked fish. Line a large rimmed baking sheet (at least 13x18 inches) with parchment paper for easy cleanup. If your baking sheet is smaller, divide ingredients between two pans to avoid overcrowding, which causes steaming instead of roasting.

In a large bowl, toss halved baby potatoes with 2 tablespoons olive oil, 1 teaspoon salt, ½ teaspoon black pepper, and 1 teaspoon garlic powder. The potatoes need the longest cooking time, so they get a head start. Spread them cut-side down on the prepared sheet pan – this maximizes crispy surface area. Roast for 15 minutes while you prepare the carrots.

While potatoes roast, peel (if necessary) and cut carrots into 2-inch pieces, then halve or quarter lengthwise to create uniform pieces about ½-inch thick. Toss with 1 tablespoon olive oil, ½ teaspoon salt, and ¼ teaspoon pepper. After potatoes have roasted 15 minutes, remove pan and add carrots in a single layer around the potatoes. Return to oven for 10 minutes.

Pat cod fillets completely dry with paper towels – this is crucial for proper searing. In a small bowl, combine 2 tablespoons olive oil, zest of 1 lemon, 1 tablespoon lemon juice, 2 minced garlic cloves, 1 teaspoon dried oregano, ½ teaspoon salt, and ¼ teaspoon pepper. Brush this mixture generously over both sides of the fish. Let it marinate while vegetables continue roasting.

After vegetables have roasted 25 minutes total (potatoes for 15, carrots for 10), remove the pan. Create space in the center by nudging vegetables to the sides. Carefully place marinated cod fillets in the cleared space. Pour any remaining marinade over the top. The fish should fit without overlapping – if not, use a second pan.

Return the sheet pan to the oven for 10-12 minutes more, until fish flakes easily with a fork and registers 145°F (63°C) at the thickest part. The potatoes should be golden and crispy-edged, carrots tender with caramelized edges. If your fish fillets vary in thickness, check thinner pieces after 8 minutes and remove them early to prevent overcooking.

Remove from oven and immediately squeeze fresh lemon juice over everything. Sprinkle with chopped fresh dill and parsley. The heat will wilt the herbs slightly, releasing their aromatic oils. Let rest 5 minutes before serving – this allows juices to redistribute in the fish and prevents burning mouths on molten vegetables.

Serve directly from the sheet pan for casual family dinners, or transfer to a large platter for company. Spoon some of the pan juices over each serving. This pairs beautifully with a crisp green salad dressed simply with lemon vinaigrette. For a heartier meal, add crusty whole grain bread to soak up the delicious pan juices.

Refrigerator Storage

Store cooled leftovers in airtight containers for up to 3 days. Keep fish and vegetables in separate containers to prevent the fish from becoming soggy. Reheat in a 350°F oven for 8-10 minutes until warmed through. Avoid microwaving as it makes the fish rubbery and potatoes soggy.

Freezer Instructions

While cooked fish doesn't freeze beautifully, you can freeze the roasted vegetables for up to 2 months. Cool completely, then freeze in single layers on a sheet pan before transferring to freezer bags. Thaw overnight in refrigerator and reheat in a hot oven. For meal prep, freeze raw marinated fish portions for up to 3 months – thaw overnight in refrigerator before using.

Make-Ahead Components

Prep vegetables up to 3 days ahead and store in separate containers. Make the marinade 5 days ahead and store refrigerated. You can even par-roast the vegetables for 20 minutes, cool, and refrigerate – then just add fish and finish roasting for 12-15 minutes. This makes weeknight dinners incredibly fast.