Flying Dutchman In-N-Out Recipe (Keto Onion Burger)

ATTENTION! Have you ever heard of the Flying Dutchman In-N-Out burger? It’s a secret menu item that only TRUE In-N-Out fans know about. But what if we told you that you could make a keto-friendly version of this iconic burger at home? That’s right, the Flying Dutchman In-N-Out recipe is here, and it’s even better than the original!

What is A Flying Dutchman At In-N-Out?

Have you heard of the term “protein style” at In-N-Out? It refers to ordering a burger without the bun, wrapped in lettuce instead. Well, the Flying Dutchman takes that concept to a WHOLE new level.

The key to this delicious burger is all in the “bun” – or, should we say, onion rings! Swapping out the usual lettuce for bun replacement, this burger goes all in with two crispy, cheese-coated onion rings as the buns, making it a super tasty meal.

But what really sets this burger apart is the secret sauce – Keto Thousand Island sauce. This tangy and creamy sauce pairs perfectly with the savory beef patties and melted cheese.

Trust me; one bite of this Flying Dutchman In-N-Out burger, and you’ll be hooked!

serving a flying dutchman burger on a plate with cheese and thousand island sauceserving a flying dutchman burger on a plate with cheese and thousand island sauce

How To Make A Grilled Flying Dutchman Burger At Home

Making this copycat recipe from In-N-Out Burger only requires 7 ingredients and 25 minutes. It’s perfect for a quick weeknight dinner or a fun weekend BBQ with friends!

All you need to make a keto onion burger is:

  • Ground beef for the perfect patties
  • Thick white onions for the “bun”
  • Cheddar cheese for extra flavor and crunch
  • Salt and pepper
  • Keto Thousand Island sauce (link to ingredients in recipe card)
  • American cheese for that classic cheesy goodness
  • A hot skillet or grill to cook it all up!

Follow the instructions in the recipe card down below for the perfect Flying Dutchman In-N-Out experience. And don’t forget to top it off with some extra Keto Thousand Island sauce for dipping!

ingredients needed to make keto onion burgeringredients needed to make keto onion burger

Which is better: white onions or yellow onions?

Hey, when it comes to picking between white onions and yellow onions for this recipe, there’s really no right or wrong choice. It all boils down to what you like better.

White onions pack a sharper, more in-your-face flavor, while yellow onions are all about that sweet, mellow vibe. Either way, they’re both great choices for the “bun” on your Flying Dutchman burger.

grilling onions in a cast iron skilletgrilling onions in a cast iron skillet

My Secret Hack To Getting That Crispy Onion Bun

You may be wondering, “How do I get that perfect crispy cheese coating on the onion bun without it sticking to the pan?”

Here’s my secret hack: use a lid!

Covering the pan with a lid while cooking the cheese will help it crisp up and become easier to remove from the pan. Trust me, it’s a game-changer.

What To Serve With Flying Dutchman Burger

Now that you have the perfect keto onion burger, you might be wondering about the sides. Because, let’s be honest, side dishes can sometimes make or break a meal. But don’t worry, we’ve got you covered with some delicious and keto-friendly options!

My go-to is using this recipe for jicama fries and making a keto version of animal-style fries! Crispy, seasoned jicama fries topped with cheese, caramelized onions, and a keto version of In-N-Out’s special sauce. It’s the perfect complement to your Flying Dutchman burger.

homemade in-n-out sauce homemade in-n-out sauce

Other great options include:

These side dishes are total game-changers for your keto diet. They’re super tasty and mix things up a bit. And the best part? You can whip them up in no time while your Flying Dutchman burgers are sizzling away. Talk about a simple yet satisfying meal!

grilled keto onion burger with a pickle grilled keto onion burger with a pickle

Love This Keto Onion Burger? Try These Recipes!

If you really enjoyed this burger recipe, try these keto recipes this summer whenever you are planning a backyard cookout:

  • Air Fryer Hamburgers are so easy to make – not to mention less greasy and healthier for you too!
  • Make the best-grilled burgers with my Hamburger Seasoning recipe made with your favorite spices like garlic powder and paprika.
  • Enjoy these Low Carb Hamburger Buns, which make the perfect bun for any type of burger or sandwich you are craving!
  • Cheeseburger Pie is the perfect dish to serve at your next cookout – it’s easy and loaded with flavor.
  • For a fun twist on traditional burgers, try this Big Mac Cheeseburger Salad recipe. It’s packed with all the flavors of a McDonald’s Big Mac but without the carbs!

Follow us on FACEBOOK, PINTEREST, and INSTAGRAM for even more tasty keto-friendly recipes!


Flying Dutchman Featured ImageFlying Dutchman Featured Image

Flying Dutchman In-N-Out Recipe (Keto Onion Burger)

This Flying Dutchman In-N-Out recipe switches up the classic burger game, making it keto-friendly with its crispy cheese onion buns and tangy sauce. It’s a cool new take on an old favorite!

Prep Time:10 minutes

Cook Time:15 minutes

Course: Main Course

Cuisine: American

Diet: Gluten Free

Review Recipe
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  • Slice onions into thick rings and cook in a hot skillet until softened and slightly charred.

  • Sprinkle 2 tablespoons of shredded cheddar cheese on one side of each onion ring. Once the cheese melts, flip it over so the cheese is on the bottom. Cover with a lid and cook until melted and crispy. About 1-2 minutes.

  • Divide ground beef into 4 portions. Form into a burger patty shape then season with salt and pepper

  • Cook patties in a skillet or grill until desired doneness is reached. Place a slice of American cheese on each patty and let it melt while the patties rest.

  • Assemble burgers by placing a cheese-coated onion ring and a spoonful of the Thousand Island sauce, followed by a beef patty, and repeating layers as needed. Finish with a cheese-coated onion.

  • Serve immediately and enjoy!


  • Serving Size = 1 burger with two patties
  • It is ESSENTIAL to cover the pan with a lid when crisping the cheese on the onions if the pan is not covered while the cheese crisps, it will be difficult to remove from the pan!

Low Carb Sweeteners | Keto Sweetener Conversion Chart


Calories: 882 | Carbohydrates: 12g | Protein: 55g | Fat: 67g | Saturated Fat: 30g | Polyunsaturated Fat: 2g | Monounsaturated Fat: 25g | Trans Fat: 3g | Cholesterol: 225mg | Sodium: 866mg | Potassium: 826mg | Fiber: 2g | Sugar: 5g | Vitamin A: 645IU | Vitamin C: 8mg | Calcium: 520mg | Iron: 5mg

Additional Info

Net Carbs:


% Carbs:


% Protein:


% Fat:




    [calories] => 882
    [carbohydrates] => 12
    [protein] => 55
    [fat] => 67
    [saturated_fat] => 30
    [polyunsaturated_fat] => 2
    [monounsaturated_fat] => 25
    [trans_fat] => 3
    [cholesterol] => 225
    [sodium] => 866
    [potassium] => 826
    [fiber] => 2
    [sugar] => 5
    [vitamin_a] => 645
    [vitamin_c] => 8
    [calcium] => 520
    [iron] => 5

Notes on Nutritional Information

Nutritional information for the recipe is provided as a courtesy and is approximate only. We cannot guarantee the accuracy of the nutritional information given for any recipe on this site. Erythritol carbs are not included in carb counts as it has been shown not to impact blood sugar. Net carbs are the total carbs minus fiber.


© – Unauthorized use of this material without written permission is strictly prohibited unless for personal offline purposes. Single photos may be used, provided that full credit is given to along with a link back to the original content.


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