As I stood in my kitchen, the inviting aroma of sweet onions sizzling in butter transported me to the shores of Alaska. This feeling is what sparked my passion for creating the comforting and rustic dish known as Alaska Halibut Olympia. Imagine tender halibut fillets, lovingly nestled on a bed of caramelized onions, cloaked in a creamy sour cream-mayo blend, all crowned with a buttery breadcrumb topping. This creamy seafood casserole is not only a delightful weeknight dinner but also a showstopper for special occasions, promising to impress even the most discerning palates. Plus, with gluten-free substitutions available, it caters to various dietary needs without sacrificing taste. Ready to dive into this culinary adventure?

Why Is Alaska Halibut Olympia so Loved?
Comforting, This dish embodies the warmth of home cooking, combining tender halibut with sweet onions for a truly satisfying meal.
Quick and Easy, With just a few simple steps, you can whip up this mouthwatering casserole in no time!
Customizable, Feel free to explore variations like adding veggies or substituting for gluten-free options to suit your needs.
Crowd-Pleaser, Whether it’s a Tuesday dinner or a family gathering, it’s sure to win over your guests with its delicious flavors.
Creamy Delight, The rich sour cream and mayo mix meld perfectly with the halibut, creating a velvety finish that's irresistibly good.
There's no doubt that once you try this Alaska Halibut Olympia, you'll be craving it again and again!
Alaska Halibut Olympia Ingredients
For the Casserole Base
- Halibut Fillets – The star of the dish; fresh and tender, providing a mild flavor that pairs beautifully with the other ingredients.
- Sweet Onions – Adds sweetness and depth; you can opt for yellow or vidalia onions for a delicious base.
For the Creamy Mixture
- Sour Cream – Introduces creaminess and a tangy flavor; Greek yogurt can be used for a lighter touch.
- Mayonnaise – Contributes richness; try light mayo for a healthier option without compromising taste.
For the Topping
- Breadcrumbs – Creates a crispy topping; use traditional or gluten-free breadcrumbs based on your dietary preferences. Crushed crackers also work great!
- Butter – Adds flavor and helps brown the topping; consider a plant-based alternative for a dairy-free version.
Seasonings
- Salt and Pepper – Enhances the overall flavor; feel free to adjust according to your taste preferences.
Don't forget, making this Alaska Halibut Olympia is all about bringing cozy flavors together in one delightful dish!
Step‑by‑Step Instructions for Alaska Halibut Olympia
Step 1: Preheat the Oven
Begin by preheating your oven to 350°F (175°C). This will ensure that your Alaska Halibut Olympia bakes evenly and achieves that perfect golden crust on top. Preheating is essential for optimal cooking, as it allows the flavors to meld beautifully as the dish bakes.
Step 2: Layer the Onions
While the oven heats, slice the sweet onions thinly. In a greased 9x13-inch baking dish, layer the onions evenly across the bottom. This forms a flavorful base for your casserole, allowing the sweetness to infuse the halibut as it bakes and caramelizes, setting the stage for deliciousness.
Step 3: Prepare the Halibut
Next, take your thawed halibut fillets and pat them dry with a paper towel. Place the fillets atop the layer of onions in the baking dish, ensuring they are evenly spaced. This positioning allows the gentle steam from the onions to keep the halibut moist, resulting in tender, flaky fish.
Step 4: Mix the Creamy Topping
In a medium bowl, combine the sour cream and mayonnaise until smooth. Spread this rich blend evenly over the halibut fillets, making sure to cover every inch. This creamy layer ensures that the halibut stays moist and adds a delightful creaminess to your Alaska Halibut Olympia.
Step 5: Add the Breadcrumbs
Sprinkle the breadcrumbs generously over the sour cream and mayo layer. Drizzle melted butter evenly over the breadcrumbs to enhance their crispiness. This topping will become beautifully golden brown and crunchy as it bakes, adding a lovely contrast to the creamy filling beneath.
Step 6: Bake the Casserole
Carefully place the baking dish in the preheated oven and bake for 35-40 minutes. Look for the halibut to be fully cooked, with the internal temperature reaching 145°F (63°C), and the breadcrumb topping to be golden brown. This step is crucial for achieving that perfect texture and flavor balance.
Step 7: Cool and Serve
Once baked, remove the Alaska Halibut Olympia from the oven and allow it to cool slightly for about 5 minutes. This short resting period helps the casserole set, making it easier to serve. Dish it out and enjoy the comforting blend of flavors that this delightful recipe brings to your table!

What to Serve with Alaska Halibut Olympia
Create a well-rounded meal that celebrates the creamy, rich flavors of this delightful casserole.
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Roasted Vegetables: The caramelized sweetness of roasted carrots and broccoli adds a lovely contrast, rounding out the meal with delightful textures.
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Steamed Green Beans: Crisp-tender green beans provide a refreshing freshness, balancing the richness of the halibut casserole beautifully.
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Wild Rice Pilaf: A nutty wild rice offers a hearty base that complements the halibut without overshadowing its subtle flavor, enhancing the dining experience.
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Simple Side Salad: A light mixed-green salad with a zesty vinaigrette is perfect for cutting through the creaminess of the dish while adding a splash of color and crunch.
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Garlic Bread: Warm, crusty garlic bread not only serves as a wonderful vessel for sopping up every last bit of sauce but also adds a delightful crunch.
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Chardonnay: Pairing this dish with a chilled glass of Chardonnay elevates the experience; its bright acidity enhances the halibut while complementing creamy flavors.
For an unforgettable meal, try mixing and matching these options to create your perfect plate alongside the Alaska Halibut Olympia!
Variations & Substitutions for Alaska Halibut Olympia
Feel free to make this creamy casserole your own by incorporating these delightful twists that will enhance your dining experience!
- Gluten-Free: Swap traditional breadcrumbs for gluten-free options to cater to dietary needs while maintaining crunch.
- Add Some Greens: Consider layering fresh spinach or kale between the onions and halibut for a nutritious boost and vibrant color.
- Herb-Inspired: Introduce fresh herbs like dill or parsley into the creamy mixture for an aromatic lift and added freshness.
- Spicy Kick: Elevate the flavor profile by adding a pinch of cayenne pepper or a dash of hot sauce to the mayo-sour cream mixture.
- Mushroom Medley: Layer sliced mushrooms along with the onions to add an earthy flavor and an extra umami element to your casserole.
- Bacon Crumble: For a savory twist, sprinkle some crispy bacon bits on top of the breadcrumbs before baking for an irresistible crunch.
- Flavor Variation: Try substituting halibut with cod or pollock for a different fish flavor while keeping the essence of a creamy casserole.
- Corny Surprise: Add a layer of fresh or frozen corn beneath the halibut for delightful sweetness and texture contrast.
With these suggestions, it’s easy to create a personalized version of your own Alaska Halibut Olympia! For a different take on hearty casseroles, check out my recipe for creamy chicken casserole or whip up a comforting dish using vegetables and quinoa for a nutritious touch!
Storage Tips for Alaska Halibut Olympia
Fridge: Store leftovers in an airtight container for up to 3 days. This will help maintain freshness and prevent unwanted moisture from affecting the dish.
Freezer: For longer storage, freeze assembled casserole before baking for up to 2 months. Cover tightly with foil or plastic wrap to protect from freezer burn.
Reheating: When ready to enjoy, bake from frozen at 350°F (175°C) for about 50 minutes, or until heated through. If thawed, reheat for 15–20 minutes, ensuring the halibut reaches an internal temperature of 145°F (63°C).
Serve Fresh: For the best taste and texture, try to serve the Alaska Halibut Olympia soon after baking, but rest assured knowing it can be kept deliciously in storage!
Make Ahead Options
Preparing your Alaska Halibut Olympia in advance is a fantastic way to save time during busy weeknights! You can layer the sweet onions and halibut in the baking dish, and then spread the creamy sour cream and mayo mixture on top up to 4 hours before baking. Just cover the dish tightly with plastic wrap to keep it fresh in the refrigerator. When you're ready to serve, simply sprinkle the breadcrumbs, drizzle with melted butter, and pop it in the oven. Not only will this keep the dish just as delicious, but it also allows you to enjoy quality family time while your casserole bakes beautifully!
Expert Tips for Alaska Halibut Olympia
- Thaw Properly: Ensure the halibut is fully thawed and patted dry before baking to minimize moisture that can make the casserole soggy.
- Layer Wisely: Avoid overcrowding the dish; space halibut fillets evenly over the onions so steam can circulate for perfectly moist fish.
- Crispy Top: To achieve the ideal golden breadcrumb crust, drizzle melted butter evenly over the topping—this ensures maximum crunch and flavor.
- Taste Adjustments: Don't be shy with the seasonings; adjusting salt and pepper to your taste can elevate the overall flavor of the Alaska Halibut Olympia.
- Make-Ahead Friendly: You can assemble the casserole up to 4 hours before baking; just cover and refrigerate. Bake just before serving for the freshest taste!

Alaska Halibut Olympia Recipe FAQs
What is the best way to select halibut fillets?
Absolutely! When choosing halibut fillets, look for fresh options that are firm to the touch and have a clean, ocean-like smell. The flesh should be white and free of any dark spots. If you're at a seafood market, don't hesitate to ask about the catch of the day for the freshest options!
How should I store leftover Alaska Halibut Olympia?
You can store leftovers in an airtight container in the refrigerator for up to 3 days. Ensure the lid is secure to keep the casserole fresh and prevent any unwanted moisture. When ready to reheat, pop it in a 350°F (175°C) oven for about 15–20 minutes.
Can I freeze Alaska Halibut Olympia, and if so, how?
Very! To freeze your casserole, assemble it but do not bake. Cover it tightly with plastic wrap and then with aluminum foil to prevent freezer burn. It can be stored for up to 2 months. When you’re ready to enjoy it, bake directly from frozen at 350°F (175°C) for about 50 minutes or thaw overnight in the fridge and reheat for 15–20 minutes.
What if my halibut is slightly overcooked?
No worries! If the halibut becomes slightly rubbery, a delicious sauce can help. Try serving it with a squeeze of fresh lemon or a light drizzle of homemade dill sauce to enhance the flavors. The key is to monitor the baking time closely, ensuring the fish flakes easily with a fork at 145°F (63°C).
Are there any dietary considerations I should be aware of?
Definitely! If you’re making this Alaska Halibut Olympia for guests with dietary restrictions, you can easily swap in gluten-free breadcrumbs and Greek yogurt instead of sour cream. Always check with your guests for any allergies to ingredients like fish, dairy, or gluten before serving, ensuring everyone can enjoy this comforting dish!

Delicious Alaska Halibut Olympia: Creamy Comfort in Every Bite
Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C).
- Slice the sweet onions thinly and layer them evenly in a greased baking dish.
- Pat the halibut fillets dry and place them on top of the onions.
- Mix the sour cream and mayonnaise in a bowl and spread over halibut.
- Sprinkle breadcrumbs over the creamy mixture and drizzle with melted butter.
- Bake in the oven for 35-40 minutes until cooked through and topping is golden.
- Let cool for 5 minutes before serving.





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