Easy Keto Big Mac Casserole Recipe: Enjoy Fast Food Flavors Guilt-Free

Welcome to the Ultimate Keto Big Mac Casserole Experience

Imagine sinking your teeth into the savory, cheesy goodness of a Big Mac but without any of the carb-laden guilt. That’s exactly what you get with this Keto Big Mac Casserole. It’s a low-carb spin on a fast-food favorite that will leave your taste buds dancing and your keto goals intact. This casserole is packed with all the classic flavors you love—juicy beef, tangy pickles, and that iconic Big Mac sauce—reimagined into a keto-friendly format that’s perfect for dinner any night of the week.

This dish is not just delicious; it’s also incredibly easy to make and perfect for meal prep. With a total time of just 55 minutes, you can have a comforting, homemade meal that’s sure to satisfy your burger cravings. Plus, it’s versatile enough to be customized to your liking, making it a surefire hit with the whole family. So, let’s dive into the delicious world of keto casserole cooking!

Keto Big Mac Casserole

The Story Behind the Keto Big Mac Casserole

As a lover of all things keto and a fan of classic American comfort food, I was on a mission to create a dish that would satisfy those fast-food cravings without breaking the carb bank. That’s how the Keto Big Mac Casserole was born. It’s a dish that brings together the best of both worlds: the indulgence of a Big Mac and the health-conscious approach of a keto diet.

One of the key components of this recipe is the ground beef, a staple in keto meals due to its high fat and protein content. When paired with full-fat cheeses like cheddar and mozzarella, you get a meal that’s not only rich in flavor but also in the essential fats needed to fuel your body on a ketogenic diet. The addition of Worcestershire sauce and apple cider vinegar gives the beef an extra depth of flavor that mimics the tangy kick of a Big Mac.

The Big Mac sauce, a vital element of this dish, is made keto-friendly by using sugar-free ketchup and mayonnaise as the base. This ensures that you get all the flavor without the added sugars that could potentially kick you out of ketosis. The sauce is a creamy, tangy, and slightly spicy concoction that ties the whole casserole together.

Finally, the fresh crunch of shredded iceberg lettuce and the tangy bite of diced pickles add a refreshing contrast to the rich and savory flavors of the casserole. These ingredients not only provide texture but also offer a dose of fiber, which is an important component of a balanced keto diet.

Keto Big Mac Casserole Cooking

Mastering the Method

Creating the perfect Keto Big Mac Casserole is all about the technique. Start by browning the ground beef with onions and garlic, ensuring that the meat is fully cooked and the onions are translucent. This is the foundation of your flavor, so don’t rush this step. Draining the excess fat is crucial to avoid a greasy final product.

When adding the Worcestershire sauce and apple cider vinegar, let the mixture simmer for a couple of minutes to allow the flavors to meld together. This creates a rich base that will infuse the entire casserole with that signature Big Mac taste.

As for the sauce, whisking the ingredients together until smooth is key. You want a sauce that’s creamy and fully combined, with no lumps. Spreading it evenly over the beef ensures every bite is as delicious as the last. When layering the cheeses, make sure to cover the sauce completely for that irresistible, golden-brown cheese topping.

Baking the casserole until the cheese is bubbly and slightly browned is the final touch that brings everything together. The cheese should be gooey and stretchy, creating a satisfying texture contrast with the beef.

Don’t forget to let the casserole cool slightly before topping with lettuce and pickles. This ensures the fresh ingredients stay crisp and don’t wilt from the heat. The result is a dish that’s warm, comforting, and packed with all the Big Mac flavors you love, without the carbs!

Keto Big Mac Casserole Final

Variation: Spicy Keto Big Mac Casserole

For those who like it hot, add a dash of your favorite hot sauce to the beef mixture and an extra sprinkle of cayenne pepper to the Big Mac sauce. This will give your casserole a fiery kick that’s sure to please spice lovers.

Variation: Crunchy Topping Keto Big Mac Casserole

If you’re missing the crunch of a toasted Big Mac bun, consider adding a layer of crushed pork rinds on top of the cheese before baking. This adds a delightful crunch and extra flavor without adding any carbs.

Variation: Deluxe Keto Big Mac Casserole

For a more deluxe version, mix in some crumbled bacon with the beef and top the casserole with diced tomatoes and avocado slices after baking. The added textures and flavors will make this dish even more irresistible.

Substitutions for Your Keto Big Mac Casserole

If you’re looking to switch things up or accommodate dietary restrictions, there are several substitutions you can make while keeping the dish keto-friendly. For the ground beef, try using ground turkey or chicken for a leaner option. Just be sure to add a bit more fat, like olive oil or avocado oil, to compensate for the lower fat content.

For the cheese, if you’re avoiding dairy, there are several plant-based cheese alternatives that melt well and can give you that cheesy texture. Look for ones that are low in carbs to keep the dish keto.

And if you’re not a fan of pickles, consider substituting with a small amount of diced green bell peppers for that crunchy texture without altering the carb count significantly.

Frequently Asked Questions

Can I make this casserole ahead of time?
Yes, you can prepare the beef mixture and sauce, layer them in the baking dish, and refrigerate. Add the cheese and bake when you’re ready to eat.

How can I store leftovers?
Store in an airtight container in the fridge for up to 3 days. Reheat in the oven or microwave until warm.

Is this casserole freezer-friendly?
It’s best enjoyed fresh, but you can freeze it. Thaw overnight in the fridge before reheating.

Can I use a different type of lettuce?
Iceberg is recommended for its crunch, but romaine can be a good substitute.

What can I use instead of sugar-free ketchup?
Tomato paste mixed with vinegar and a keto-friendly sweetener can work as an alternative.

Keto Big Mac Casserole

Dive into a delectable, low-carb spin on a fast-food favorite with our Keto Big Mac Casserole. This dish brings all the classic flavors of a Big Mac without the guilt, perfect for satisfying your burger cravings while keeping it keto-friendly.
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Prep Time 20 minutes
Cook Time 35 minutes
Total Time 55 minutes
Course Dinner
Cuisine American
Servings 6 servings
Calories 540 kcal


  • Large skillet
  • 9x13 inch baking dish
  • Mixing bowl
  • Whisk
  • Cheese grater


  • 1 ½ pounds ground beef 680g
  • ½ cup diced onion 75g
  • 2 cloves garlic, minced
  • 1 teaspoon sea salt
  • ½ teaspoon ground black pepper
  • 2 tablespoons Worcestershire sauce 30ml
  • 1 tablespoon apple cider vinegar 15ml
  • 1 cup shredded cheddar cheese 113g
  • 1 cup shredded mozzarella cheese 113g
  • 3 cups iceberg lettuce, shredded 210g
  • ½ cup pickles, diced 75g
  • ½ cup unsweetened dill pickle relish 120g
  • ½ cup mayonnaise 120g
  • 2 tablespoons sugar-free ketchup 30g
  • 1 tablespoon mustard 15g
  • 1 teaspoon white vinegar 5ml
  • 1 teaspoon paprika
  • ½ teaspoon onion powder
  • ¼ teaspoon garlic powder


  • Preheat your oven to 350°F (175°C).
  • In a large skillet over medium-high heat, brown the ground beef with the diced onion and minced garlic. Season with sea salt and black pepper. Cook until the beef is no longer pink and the onions are translucent. Drain excess fat.
  • Stir in Worcestershire sauce and apple cider vinegar to the beef mixture, and cook for an additional 2 minutes.
  • Transfer the beef mixture into a greased 9x13 inch baking dish.
  • In a small bowl, whisk together mayonnaise, sugar-free ketchup, mustard, white vinegar, paprika, onion powder, and garlic powder to create the Big Mac sauce.
  • Spread the sauce evenly over the beef mixture in the baking dish.
  • Sprinkle shredded cheddar and mozzarella cheese over the sauce layer.
  • Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
  • While the casserole is baking, shred the iceberg lettuce and dice the pickles.
  • Once the casserole is done, let it cool for 5 minutes, then top with shredded lettuce and diced pickles.
  • Serve immediately, garnished with dill pickle relish.


For a spicier kick, add a dash of hot sauce to the Big Mac sauce.
If you prefer a crunchier topping, consider adding a sprinkle of crushed pork rinds on top before baking.
Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave until warm throughout.


Calories: 540kcalCarbohydrates: 6gProtein: 32gFat: 44gFiber: 2gNet Carbs: 4g
Keyword Keto Big Mac Casserole, Keto Casserole, Keto Dinner Recipe, Low Carb Big Mac
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