Super Easy Costco Salmon Recipe

by Elaine on January 18, 2009 · 6 comments

in Recipes

If your family is like mine, you spend a lot of time shopping at warehouse stores such as Costco or Sam’s Club. The groceries are often priced at a great value, but packaged in huge quantities. Whenever I pass by the beautiful slabs of fresh salmon, I’m tempted to buy a package. If I’m not having people over, the thought of eating salmon every day for a week usually changes my mind.

We discovered a new recipe when we hosted a pot luck Christmas party with friends a few weeks ago. Our dear friend Anne borrowed our kitchen to make her new salmon dish. She brought three ingredients, assembled them, and popped them in the oven. About 30 minutes later, a delicious main course was served! By the end of the night, every delicious morsel had been eaten.

1 cup mayonnaise (may use regular or low fat)
1 packet onion soup mix (any brand)
1 large salmon fillet from Costco

Stir the onion soup mix into the mayonnaise. Refrigerate the sauce until ready to bake.


  1. Preheat the oven to 350 degrees.
  2. Place the salmon on an aluminum foil covered baking sheet. Be sure the pan is deep enough to catch any drippings.
  3. Cover the top of the salmon with the onion-mayo sauce.
  4. Bake approximately 30 minutes, depending on the thickness of the fish. When your kitchen fills with the scent of onions and salmon, start checking the fish. The internal temperature of the thickest portion should reach 140 degrees. If you don’t have a cooking thermometer, the fish should flake easily with a fork when fully cooked.
  5. Remove from the oven and allow to rest for 5-10 minutes. The sauce will turn into a tasty brown crust that keeps the fish moist and tender. Delicious!

Serve over a bed of rice and a side of steamed spinach for a super healthy, easy meal.

We’ve also prepared the salmon by seasoning it with salt and pepper and grilling on a hickory plank as well as sprinkling it with Hawaiian salt and olive oil before baking. We’d love to hear how you prepare your Costco salmon.

Please check out our other recipes.  Many of them have 5 ingredients or less!


1 Karen January 19, 2009 at 10:51 pm

I cut my salmon up into 5 or 6 oz. pieces and freeze in portions of 3 or 4 pieces in saran wrap then a freezer bag. I just pop one out every weekend and its ready on Monday. That way you don’t have to eat the whole big salmon in one week. It really doesn’t taste bad doing this and its great always having it on hand.

Hope this helps.

2 Sharon January 19, 2009 at 11:41 pm

Oh my goodness! I just posted a salmon recipe on our blog too. Salmon is on our minds at the same time :) I’m adding a link to your blog to my link love this week so our readers can see your version, yummy – can’t wait to try it too.

3 Elaine January 20, 2009 at 12:00 am

Karen, I forgot to mention portioning the salmon before cooking and freezing the extra. The onion-mayo sauce could also be portioned and refrigerated until needed as well.

Sharon, your site lists a great way to pan fry 1 or 2 portions of salmon and tilapia at a time. Thanks! I’ll try your seasoning blend next time!

4 Joy January 20, 2009 at 12:10 am

THANKS for sharing, Elaine! I love salmon and will definitely consider getting one from Costco on our next visit!

5 Debbie January 27, 2009 at 10:28 am

Wow, it is easy!!

I love the soup mix with my
pot roast too.


6 Dorothy February 24, 2009 at 10:54 am

This is the best salmon recipe that I have ever eaten. I cook for one so cut it up in portion sizes. I have a Half Time Micro oven that bakes and I baked it in there using the half-time feature cutting the baking time in half. When I
cook for company I will still use the Half-Time feature.

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