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Keto Copycat In-N-Out Burger

Keto Copycat In N' Out Burger

Get your favorite smash burger fix at home with this keto double double "protein" style copycat burger recipe that tastes just like In N' Out! 

Course Recipes
Cuisine American
Keyword Keto Copycat In N' Out Burger
Prep Time 15 minutes
Cook Time 5 minutes
Total Time 20 minutes
Servings 4
Calories 371kcal
Author Bon Appeteach


  • Burgers:
  • 1 lb. Ground Beef 80/20 preferred
  • Salt & Pepper
  • 4 slices Yellow American Cheese
  • Sauce Ingredients:
  • 1/3 cup Mayo I like avocado mayo personally
  • 1 Tbsp. Sugar Free Ketchup or sub 1 tsp. Organic Tomato Paste
  • 1 tsp. Mustard
  • 2 Tbsp. Diced Pickles
  • 1-2 tsp Pickle Juice
  • 1/2 tsp. Salt
  • 1/2 tsp. Paprika
  • 1/2 tsp Garlic Powder
  • Toppings:
  • Iceberg Lettuce "buns"
  • Sliced tomato
  • Pickles
  • 1/2 Yellow Onion sliced thin (traditional In N' Out caramelizes the onions too)
  • [Optional - Smart Buns]


  • Start by preparing the sauce. In a small bowl combine the mayo, sugar free ketchup, 1 tsp of mustard, diced pickles, pickle juice, and spices. Mix together and test taste. Flavors do meld better together over time so feel free to adjust.
  • To prep the hamburger patties, measure out 2 oz. of meat per patty and roll into a meatball. Repeat so you have 10 total meatballs. Season the tops with sea salt and cracked black pepper.
  • Preheat your cast iron/ griddle to a high heat. Add a little oil to the pan if necessary. Place two meatballs onto the griddle or pan, use a wide spatula and press down. I like to use a potato masher to help me press and smash the burgers as flat as possible. Baste the top (optional) in mustard before flipping. Work quickly. As the edges appear to brown, flip them. Place one piece of American cheese on one burger patty and stack the second patty over it.
  • To assemble the patty I start with a bottom piece of lettuce (my bun). add the slice onion, the double stacked burger patty, tomato, pickles, and the sauce. Cover with the second lettuce bun and dig in!


The nutritional information below is for the sauce and burger patties only. Please calculate your own for adding additional vegetables like lettuce, tomato, onion etc. since this varies for personal taste.


Serving: 1g | Calories: 371kcal | Carbohydrates: 3g | Protein: 34g | Fat: 24g | Saturated Fat: 10g | Polyunsaturated Fat: 11g | Trans Fat: 1g | Cholesterol: 117mg | Sodium: 439mg | Sugar: 1g