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Sheet Pan Herb-Roasted Halibut with Garlic Green Beans and Baby Potatoes

By PanPotPlates Test KitchenReviewed by PanPotPlates Editorial TeamPublished Apr 11, 2026 · Updated May 11, 2026
Mediterranean-Inspired 30 mins sheetpanonepanpescatarianhealthyfamily-friendlyglutenfreedairyfreequickeasyseasonalflavorfulweeknight

A quick and easy Mediterranean-inspired sheet pan dinner featuring perfectly roasted halibut fillets seasoned with herbs, tender garlic green beans, and crispy baby potatoes. This healthy pescatarian dinner is naturally gluten- and dairy-free, ideal for busy weeknights and family meals.

Sheet Pan Herb-Roasted Halibut with Garlic Green Beans and Baby Potatoes
Prep 10 min
Cook 20 min
Total 30 min
Servings 4
Difficulty easy
Cuisine Mediterranean-Inspired

Recipe Details

Prep10 min
Cook20 min
Total30 min
Servings4
Difficultyeasy
CuisineMediterranean-Inspired
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Ingredients

Servings 4
  • 1 1/2 pounds baby potatoes, halved
  • 12 ounces fresh green beans, trimmed
  • 2 tablespoons olive oil, divided
  • 3 garlic cloves, minced
  • 1 teaspoon dried oregano
  • 1 teaspoon dried thyme
  • 1/2 teaspoon paprika
  • Salt and freshly ground black pepper, to taste
  • 4 halibut fillets (about 6 ounces each), skin removed
  • 1 lemon, thinly sliced
  • Fresh parsley, chopped (for garnish)

Instructions

  1. Preheat the oven to 425°F (220°C) and line a large rimmed sheet pan with parchment paper or lightly grease it.
  2. In a large bowl, toss baby potatoes with 1 tablespoon olive oil, 1/2 teaspoon salt, 1/4 teaspoon black pepper, and half of the dried oregano and thyme.
  3. Arrange the potatoes on one side of the sheet pan in a single layer. Roast for 10 minutes.
  4. Meanwhile, toss the green beans with the remaining 1 tablespoon olive oil, minced garlic, the remaining oregano and thyme, paprika, and a pinch of salt and pepper.
  5. After potatoes have roasted for 10 minutes, remove the pan and shift the potatoes to one side to make room for green beans and halibut.
  6. Spread the green beans evenly beside the potatoes on the sheet pan.
  7. Place halibut fillets spaced evenly on the pan. Season generously with salt and pepper and top each fillet with lemon slices.
  8. Return the sheet pan to the oven and roast for 12-15 minutes, until halibut is opaque and flakes easily, potatoes are tender, and green beans are crisp-tender.
  9. Remove from oven and garnish with fresh chopped parsley.
  10. Serve immediately for a fresh, healthy Mediterranean sheet pan dinner.

Frequently Asked Questions

Reader questions and answers for this recipe will appear here.

Customize this sheet pan dinner to your tastes or dietary needs with these ingredient swaps while keeping it quick, healthy, and family-friendly:

  • Halibut: Substitute with other flaky white fish like cod, tilapia, or haddock for a milder taste or budget-friendly option. Salmon also works for a richer flavor.
  • Baby Potatoes: Use fingerling potatoes, small sweet potatoes, or pearl onions to add seasonal variety and texture.
  • Green Beans: Swap in asparagus, broccolini, or snap peas as tasty, crisp-tender vegetable options.
  • Herbs: Replace dried oregano and thyme with fresh rosemary, basil, or dill to alter the Mediterranean flavor profile while keeping it light.
  • Olive Oil: Avocado oil or melted coconut oil can be used as heart-healthy, dairy-free alternatives.
  • Garlic: Garlic powder may replace fresh garlic for convenience without losing much flavor.
  • Seasonings: Try smoked paprika or cumin in lieu of regular paprika for a smoky twist.

These substitutions maintain alignment with key tags like sheetpan, onepan, pescatarian, healthy, glutenfree, and family-friendly, allowing you to personalize this quick, flavorful weeknight meal to suit your preference and pantry.

Pan Or Pot Required

For this Sheet Pan Herb-Roasted Halibut with Garlic Green Beans and Baby Potatoes, you only need a large rimmed sheet pan. This recipe is designed as a sheet pan dinner so all ingredients roast together, simplifying prep and cleanup while maximizing flavor. Using one sheet pan also keeps the meal healthy, gluten-free, and family-friendly.

Choose a rimmed sheet pan at least 13x18 inches to fit halibut fillets, baby potatoes, and green beans comfortably without crowding. Lining the pan with parchment paper or lightly greasing it ensures easy release and cleanup.

The one-pan roasting method evenly cooks ingredients, melding Mediterranean herb flavors beautifully, all without needing additional pots or pans. This is perfect for quick weeknight dinners where minimal fuss is key.

Cookware Size Guidance

This recipe is crafted as a classic Sheet Pan Dinner, so choosing the right pan size is essential. Use a large rimmed sheet pan about 15x10 inches or larger to allow enough room for 4 halibut fillets plus vegetables without overcrowding. Rimmed edges help contain juice and facilitate easy oven handling.

A properly sized pan prevents steaming and promotes roasting for golden, crisp baby potatoes and perfectly cooked fish. If your pan is smaller, roast in batches or two pans, which may slightly affect cooking time.

Lining the pan with parchment paper or a silicone baking mat enhances cleanup without impacting texture, helping maintain your meal’s quick and easy appeal.

Cookware Swap Guidance

Designed as a convenient Sheet Pan Dinner, this recipe works best with a large rimmed sheet pan for even roasting and minimal cleanup. However, if you don't own one, several alternatives will still yield great results while preserving the dish’s quick, healthy, and family-friendly nature.

  • Large Rimmed Baking Sheet: Ideal for optimal air circulation and even cooking, giving the best texture for potatoes and fish.
  • Roasting Pan with Wire Rack: Use to elevate halibut, allowing juices to drip onto vegetables beneath; cooking times may differ.
  • Oven-Safe Skillet or Cast Iron Pan: Offers good searing and roasting; ensure enough surface area to avoid overcrowding.
  • Casserole or Baking Dish: Suitable but expect less crispiness due to limited airflow.

For best results, avoid electric slow cookers or Instant Pots, which won't achieve the roasted caramelization crucial to this Mediterranean-inspired meal. Using parchment or silicone mats aids cleanup with any alternative cookware.

Adjust roasting times slightly if using deeper pans to ensure even cooking of halibut, potatoes, and green beans.

Leftovers Quality

This Sheet Pan Herb-Roasted Halibut dinner makes delicious leftovers that store well when refrigerated promptly in airtight containers, ideally within two hours of cooking. Leftovers stay fresh for up to 2 days, maintaining flavor and texture.

Since fish can lose texture quickly, we recommend enjoying leftovers soon after cooking. For mealprep convenience, portion into single servings that can be reheated easily.

To reheat, warm leftovers in a 300°F (150°C) oven on a baking sheet for 10-15 minutes, loosely covered with foil to retain moisture and keep the halibut tender and flaky. Alternatively, reheat gently in a skillet over medium-low heat, turning occasionally to prevent drying.

Avoid microwaving, which can dry out fish and vegetables unevenly. Due to the delicate textures, freezing is not recommended for best quality.

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