Keto In-N-Out Burger Copycat with Cheesy Onion Buns
Make a keto In-N-Out burger copycat at home with cheesy onion buns. This low-carb burger is juicy, flavorful, and perfect for a healthy, satisfying meal.
If you’re craving a classic fast-food burger but want to stay low-carb, this keto In-N-Out burger copycat with cheesy onion buns is exactly what you need.
Inspired by the iconic flavors of In-N-Out Burger, this recipe swaps traditional buns for crispy, cheesy onion rounds—giving you all the taste without the carbs.
It’s juicy, cheesy, and incredibly satisfying—perfect for keto, low-carb, or anyone looking for a healthier burger alternative.
Jump to Recipe🍔 Why You’ll Love This Keto In-N-Out Burger
- Low-carb and keto-friendly
- No traditional bread buns
- Packed with flavor and texture
- Easy to make at home
- Great for meal prep
🥗 What Makes It “Keto”?
Traditional burgers are high in carbs because of the bun. This recipe replaces it with cheesy onion buns, which are:
- Low in carbohydrates
- High in flavor
- Naturally gluten-free
🛒 Ingredients You’ll Need for Keto In-N-Out Burger
Serves: 2–3 burgers
Prep Time: 15 minutes
Cook Time: 20 minutes
Total Time: 35 minutes
Calories: ~450 per serving
For the Burger Patties:
- 1 lb ground beef
- Salt and pepper
- 1/2 tsp garlic powder
For the Cheesy Onion Buns:
- 1 large onion (sliced into rings)
- 1 cup shredded cheddar cheese
For the Sauce (Optional but Recommended):
- 1/4 cup mayonnaise
- 1 tbsp ketchup (low sugar for keto)
- 1 tbsp mustard
- 1 tsp pickle relish
Toppings:
- Lettuce
- Tomato slices
- Pickles
- Extra cheese
🔪 Step-by-Step Instructions
1. Make the Cheesy Onion Buns
- Preheat oven to 400°F (200°C).
- Place onion rings on a baking sheet.
- Sprinkle cheese over each ring.
- Bake for 10–15 minutes until golden and crispy.
Tip: Let them cool slightly so they firm up.
2. Cook the Burger Patties
- Season ground beef with salt, pepper, and garlic powder.
- Form into patties.
- Cook in a skillet over medium heat (3–4 minutes per side).
Pro Tip: Don’t press the patties—this keeps them juicy.
3. Prepare the Sauce
Mix all sauce ingredients in a small bowl until smooth.
4. Assemble the Burger
- Place one cheesy onion bun on the bottom.
- Add lettuce, patty, cheese, and toppings.
- Drizzle sauce.
- Top with another onion bun.
🔥 Pro Tips for Perfect Keto Burgers
- Use 80/20 ground beef for juiciness
- Let onion buns cool before assembling
- Toast cheese slightly longer for crisp texture
- Use fresh toppings for balance
🔗 More Recipes: 🔥 12 Easy Keto Dinner Recipes You’ll Want Every Night!
🔄 Easy Variations to Try
1. Double Patty Burger
Add an extra patty for more protein.
2. Spicy Version
Add jalapeños or spicy sauce.
3. Bacon Keto Burger
Add crispy bacon for extra flavor.
4. Lettuce Wrap Option
Use lettuce instead of onion buns for fewer calories.
🍽 What to Serve with Keto Burgers
Complete your meal with:
- Zucchini fries
- Cauliflower mash
- Side salad
- Pickles
🧊 How to Store
Refrigerator:
- Store patties separately up to 3 days
Reheat:
- Warm in skillet for best texture
⚠️ Common Mistakes to Avoid
- Overcooking the beef
- Not letting buns set
- Using too much sauce (can get messy)
- Cutting onions too thin
❓ FAQs About Keto Burgers
Are onion buns really keto?
Yes! Onions have some carbs, but in moderation they fit keto diets.
Can I make this dairy-free?
Use dairy-free cheese alternatives.
Can I grill the patties?
Absolutely! Grilling adds extra flavor.
What’s the best cheese to use?
Cheddar works best for crispiness.
🛠 Kitchen Tools You’ll Need
- Baking sheet
- Skillet or grill pan
- Spatula
- Mixing bowl
🔗 You may also like: 15 Easy Keto Recipes for Beginners – Dinner, Breakfast & Desserts!
Keto In-N-Out Burger Copycat with Cheesy Onion Buns
Course: MainCuisine: Keto, AmericanDifficulty: Easy4
servings15
minutes20
minutes450
kcalIngredients
For the cheesy onion buns
1 large onion, sliced into thick rings1 cup shredded cheddar cheese
½ cup shredded mozzarella cheese
For the burgers
1 lb ground beefSalt and black pepper to taste
4 slices cheddar cheese
1 tablespoon butter or oil
For toppings
Lettuce leavesTomato slices
Pickles
2 tablespoons sugar-free ketchup
2 tablespoons mayonnaise
1 teaspoon mustard
Directions
- Preheat a skillet or griddle over medium heat.
- Place onion rings on the skillet and sprinkle shredded cheddar and mozzarella on top of each ring. Cook until the cheese melts and forms a crispy “bun” base. Flip carefully and cook another 1–2 minutes. Set aside.
- Form the ground beef into 4 patties and season with salt and pepper.
- Cook the patties in the skillet with butter or oil for 3–4 minutes per side, until cooked to your desired doneness.
- Add a slice of cheddar cheese on each patty and let it melt.
- Mix mayonnaise, ketchup, and mustard to create a simple burger sauce.
- Assemble the burgers by placing a beef patty between two cheesy onion buns.
- Add lettuce, tomato, pickles, and sauce.
- Serve immediately while hot.
Notes
- Extra flavor: Add grilled onions or bacon for a richer taste.
Low-carb tip: Use sugar-free sauces to keep it keto-friendly.
Cheese swap: Pepper jack or Swiss cheese works great too.
Serving idea: Pair with a side of cauliflower fries or salad.
Storage: Best enjoyed fresh, but patties can be stored for up to 2 days.
❤️ Final Thoughts
This keto In-N-Out burger copycat with cheesy onion buns is a game-changer for anyone craving a classic burger without the carbs. It’s rich, satisfying, and packed with flavor while still fitting into a low-carb lifestyle.
Once you try it, you won’t miss regular buns at all.
💬 Would you try this keto burger?
📌 Save this recipe for your next low-carb meal!
Family favorite recipe : Healthy Food and Drink Recipes
