Flying Dutchman Burger

If you love juicy burgers but want to skip the carbs, this copycat recipe is your ultimate dream come true. We are recreating the famous In-N-Out secret menu item right in your own kitchen. Instead of a traditional bread bun, thick slices of sweet, grilled onions clasp two savory, melted cheese-covered beef patties. Every single bite delivers a massive explosion of savory flavor, rich textures, and nostalgic fast-food vibes. Additionally, it takes less time to whip up these protein-packed patties than it does to sit in a busy drive-thru line. Consequently, you can satisfy your late-night burger cravings guilt-free any day of the week.

Copycat In-N-Out Flying Dutchman Burger Highlights

• Bun-Free Brilliance: Thick, caramelized onion rounds replace the bread seamlessly.
• Double Beef Power: Two smash-style patties ensure maximum juiciness and a perfect sear.
• Melted Cheese Goodness: Real cheddar cheese melts perfectly between the hot meat layers.
• Signature Copycat Sauce: A quick, creamy, tangy spread brings the authentic drive-thru flavor home.

Why make my Copycat In-N-Out Flying Dutchman Burger recipe

• Ready in 15 minutes: You can skip the long drive-thru lines and make this incredibly fast meal at home.
• Zero fancy equipment needed: A simple cast-iron skillet or flat griddle is all you actually need for success.
• Perfect for keto meal prep: You can easily fry the patties ahead of time for quick weekday lunches.
• Incredibly high protein: This satisfying dish keeps you full for hours while remaining completely low-carb.

Does Copycat In-N-Out Flying Dutchman Burger Fit a Keto Lifestyle?

Yes, this recipe is absolutely perfect for anyone following a strict keto lifestyle. Because we completely eliminate the high-carb hamburger bun, the net carbs drop to a mere 5 grams per serving. The combination of grass-fed ground beef and full-fat cheddar cheese provides excellent healthy fats and quality protein. Meanwhile, grilling the onions coaxes out natural sweetness without kicking you out of ketosis. Therefore, you can confidently enjoy this indulgent, savory meal while staying perfectly on track with your macro goals.

Why I Make This Copycat In-N-Out Flying Dutchman Burger on Repeat

I make this incredible recipe constantly because it genuinely satisfies my comfort food cravings without bloating. First, the crisp, charred texture of the grilled onions perfectly mimics the satisfaction of a toasted bun. Next, the smoky sear on the beef patties paired with gooey cheese creates an unmatched flavor profile. Finally, the homemade signature burger sauce adds a luxurious, tangy finish that ties everything together beautifully.

Why This Recipe is Special:

• Naturally gluten-free: This dish uses whole-food ingredients instead of processed wheat alternatives.
• Massive crunch factor: Thick-cut grilled onions offer a spectacular, juicy crunch with every bite.
• Budget-friendly comfort: You can recreate an iconic restaurant favorite at a fraction of the cost.
• Extremely customizable: It is simple to add extra pickles, jalapeños, or bacon to suit your mood.

My personal experience

• The ultimate craving crusher: Whenever a fast-food craving strikes me, this easy recipe instantly saves my diet.
• Perfecting the onion flip: I learned that cutting the onions extra thick prevents them from falling apart on the hot griddle.
• The cast-iron advantage: Using a heavy skillet gives the beef those beautifully crispy, smashed edges every single time.
• Sauce is non-negotiable: Making a double batch of the signature spread ensures I never run out during dinner.

Perfect For:

• Busy weeknight dinners: This meal comes together in minutes when you are short on time.
• Post-workout fuel: The high-protein content supports muscle recovery while keeping your energy stable.
• Keto diet plans: It fits into your daily low-carb macronutrient targets without any complex calculations.
• Weekend cheat-feel meals: You get all the fun of a cheat meal without breaking your healthy habits.

Why You’ll Love This Recipe:

• Unbelievably juicy results: Smashing the patties seals in the juices while creating flavor-packed crispy edges.
• Authentic restaurant taste: The combination of yellow mustard and tangy sauce replicates the original secret menu flavor.
• Minimal cleanup required: You only need one skillet to cook both the onions and the beef patties.
• Family-approved dinner: Even non-keto eaters love this fun, messy, and incredibly flavorful finger food.

Key Ingredients

I’ve included everything below to make this recipe easy to follow at home. For the full printable recipe instructions and ingredient quantities, scroll to the Recipe card at the bottom of this post.

• Ground Beef: I prefer using 80/20 lean-to-fat ground beef for this recipe. This specific ratio ensures the patties stay incredibly juicy and develop a beautiful crust.
• Yellow Onions: Cut these into thick, sturdy rounds to form your outer burger structure. They provide a sweet, caramelized crunch that holds the entire burger together perfectly.
• Cheddar Cheese: Sharp cheddar slices melt beautifully over the hot, freshly seared beef. It adds a rich, salty creaminess that balances the sweetness of the onions.
• Yellow Mustard: Spread a dollop directly onto the raw meat before flipping it over. This technique creates an authentic, mustard-seared crust just like the real drive-thru version.
• Mayonnaise: This serves as the rich, creamy base for our quick copycat burger sauce. It blends smoothly with the other condiments to mimic the iconic secret spread.
• Sugar-Free Ketchup: A small splash adds the necessary sweetness without introducing unwanted carbs or sugars. It keeps the copycat sauce tasting highly authentic while remaining keto-safe.
• Pickle Relish: Stir in a spoonful of dill relish for a bright, tangy crunch. This ingredient cuts through the richness of the beef and cheese beautifully.

How to make this Copycat In-N-Out Flying Dutchman Burger

I’ve included everything below to make this recipe easy to follow at home. For the full printable recipe instructions and ingredient quantities, scroll to the Recipe card at the bottom of this post.

Step 1- Slice two large yellow onions into thick, whole rounds that will stay intact during cooking.

Step 2- Shape the ground beef into thin, flat patties slightly wider than your onion slices.

Step 3- Heat a large cast-iron skillet over medium-high heat and grease lightly with oil.

Step 4- Sear the onion rounds for roughly three to four minutes per side until lightly charred.

Step 5- Remove the grilled onions carefully from the skillet and set them aside on parchment paper.

Step 6- Place the beef patties into the hot skillet and press down firmly using a heavy spatula.

Step 7- Season the meat generously with salt and spread a teaspoon of yellow mustard on top.

Step 8- Flip the patties after two minutes, then immediately place a slice of cheddar cheese over each.

Step 9- Stack two cheesy patties together once the cheese is completely melted and gooey.

Step 10- Sandwich the stacked beef patties tightly between two of your warm, grilled onion rounds.

Step 11- Whisk the mayonnaise, sugar-free ketchup, and pickle relish together in a small bowl until smooth.

Step 12- Serve the warm burger immediately alongside a generous side of your homemade signature sauce.

Common Mistakes to Avoid:

• Slicing onions too thin: If you slice them thin, they will disintegrate and fail to hold the beef patties.
• Skipping the mustard sear: Omitting the mustard means losing that classic, distinct In-N-Out copycat flavor profile.
• Overcrowding your hot skillet: Too many patties in the pan will cause the meat to steam rather than sear beautifully.
• Moving the meat too early: Let the patties cook undisturbed for two minutes to build a dark crust.

Required Equipment:

• Cast-iron skillet: This pan retains intense heat to create the perfect crispy, smashed burger edges.
• Heavy-duty spatula: A sturdy metal tool allows you to press the meat flat and flip easily.
• Sharp chef's knife: This helps you cut perfectly even, thick onion rounds without crushing the layers.

Caleb’s Recipe Tips

To get the absolute best results, make sure your skillet is screaming hot before adding the beef. Trust me, I’ve learned this the hard way after ending up with grey, boiled-looking meat in the past! If your onion layers start separating during cooking, simply slide a toothpick through the side to lock them together. Then, remember to pull the toothpick out right before you take your first delicious bite. Lastly, mix your burger sauce a few hours early so the flavors have plenty of time to marry.

Storage Instructions:

If you happen to have leftovers, store the beef patties and grilled onions separately in airtight containers. They will stay fresh in the refrigerator for up to three days while remaining perfectly keto-friendly. However, I do not recommend freezing the grilled onions because they become incredibly mushy upon thawing. When you are ready to eat, reheat the cheesy beef patties in a hot skillet for two minutes. Afterward, warm the onions briefly, assemble your fresh burger, and enjoy immediately with your leftover sauce.