Caramelized Onion Stuffed Burgers

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These beautiful, juicy burgers stuffed with sweet caramelized onions are a delightful treat that the whole family will love! Top with creamy spicy garlic aioli and serve on a lettuce bun for a Whole30 and Low Carb meal.

Originally Posted: 2019; updated 05/2021

Caramelized Onion Stuffed Burgers on a lettuce bun topped with creamy spicy garlic aioli and a pickle and tomato

What You Need:

  • Ground Beef – I get all my meat from ButcherBox
  • Yellow Onions
  • Garlic
  • Avocado Oil
  • Ghee
  • Salt
  • Pepper
  • Garlic Powder
  • Paprika

Caramelized Onions:

Okay, let’s talk about caramelized onions. They are so easy to make, but they do take a little patience. They cook over low heat and the onions release their natural sugars to create that yummy caramel flavor that we all love. I cook them in a mix of avocado oil and ghee. If you are not doing a round of Whole30, I also love to use grass fed butter (like KerryGold). Once the onions are done caramelizing, I let them cool completely and then it is time to stuff the burgers!

Raw burger patties on a lined baking sheet being stuffed with caramelized onions

Assemble Your Caramelized Onion Stuffed Burgers:

I like to keep the patties for these burgers simple. It lets the flavors of the beef and onions shine! I form 12 equal sized patties with my hands and then season them with a simple mixture of salt, pepper, garlic powder and paprika. I place the a little of the onion mixture in the middle of one patty and then place another patty on top of that. Using my hands, I re-form it to shape a new patty.

hand holding a Caramelized Onion Stuffed Burger

How to Cook Your Stuffed Burgers:

These are big ol’ burgers so you want to make sure to cook them properly. My favorite way to do this without sacrificing flavor, is by starting off in a super hot cast iron skillet. This gets a lovely crust on the outside and then they can be transferred to the oven right in the skillet to finish cooking. It works every time.

Spicy Garlic Aioli

How to Serve:

We eat our caramelized onion stuffed burgers on a lettuce bun to keep them gluten free and Whole30 compliant. I always make a little spread of toppings so that the family can customize their own. My Spicy Garlic Aioli is the sauce in the picture and I always make it for our burgers. It is so easy and so delicious.

Side Dishes:

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Caramelized Onion Stuffed Burgers

These Caramelized Stuffed Onion Burgers are made with perfectly seasoned beef patties stuffed with beautiful sweet caramelized onions.
5 from 10 votes
Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Course Main Course
Cuisine American
Servings 6 burgers
Calories 476 kcal


  • 2 lbs Ground Beef
  • 3 Yellow Onions thinly sliced
  • 2 Tbls Avocado Oil divided
  • 1 Tbls Ghee
  • 2 tsp Salt divided
  • 1 tsp Pepper divided
  • 1 tsp Garlic Powder
  • 1 tsp Paprika
  • 1 clove Garlic minced


  • Pre-heat the oven to 375'
  • In a large mixing bowl, add in the ground beef, 1 tsp of salt, and 1/2 tsp pepper
    Mix to combine and form into 12 equal sized patties
    Place the formed patties onto a lined baking sheet in the fridge
  • Heat 1 Tbls of the avocado oil and the ghee in a large cast iron skillet over medium low heat
    Add in the onions and let cook (stirring occasionally) until slightly brown and caramelized (about 15-20 minutes)
    When done, turn off the heat and stir in the minced garlic
    Remove from pan and let cool completely
  • Take the patties out of the fridge and season the outside with remaining salt & pepper, garlic powder, and paprika
    Place about 1 Tbls of the onions in the center of 6 of the patties and use the other 6 patties on top
    Use hands to form back into full size patties with the onions on the inside
  • Add remaining avocado oil to the cast iron skillet and bring to medium/high heat
    Once hot, place the burgers in the skillet and cook on each side for 4 minutes
    Then place the skillet in the oven to finish cooking
    Cook to your preference. For medium rare, cook about 5 minutes in the oven. Increase time for medium and well done


Calories: 476kcalCarbohydrates: 5gProtein: 27gFat: 38gSaturated Fat: 14gCholesterol: 114mgSodium: 879mgPotassium: 503mgFiber: 1gSugar: 2gVitamin A: 189IUVitamin C: 4mgCalcium: 40mgIron: 3mg
Keyword burgers, keto, paleo, whole 30
Tried this recipe?Mention @thebetteredblondie


    1. It is Spicy Garlic Aioli. It is linked in the post under the picture of the sauce and under the ‘You Might Also Like’ section. You can also search for it in the search box. Enjoy!

    1. 5 stars
      Hi Robin, I don’t have a grill so I wrote the recipe the way I cooked and tested it. You can absolutely use a grill if that is the method that you prefer.

    1. 5 stars
      Hi Virginia, I haven’t tried this personally, but I would think it would work fine. Let me know if you try it and how it goes.

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