If you’re craving the iconic flavors of a McDonald’s Big Mac but want to keep it low-carb, this Keto Big Mac Casserole is just the thing you need. It’s easy to make, packed with all the classic Big Mac toppings, and perfect for meal prep or a family dinner. Plus, it’s gluten-free and keto-friendly!

Let’s face it: some days, you crave that juicy goodness of a juicy burger but don’t want to break out the grill or deal with the mess. Cue this casserole—a true kitchen hero!

It’s quick to prep and easy to assemble, and once it’s in the oven, you can sit back and relax (or, you know, start binge-watching your favorite series).

What makes this dish even more fun is the chance to customize the toppings!

Whether you’re all about extra cheese, crave a fresh crunch from lettuce, or can’t resist a bit of zing from dill pickles, this casserole has you covered. And let’s not forget the homemade Big Mac sauce, which brings all the flavors together perfectly.

Who knew you could take a fast-food favorite and turn it into a delicious, low-carb meal right at home? That’s the beauty of this copycat Big Mac casserole!

Tip: If you are craving an actual burger, you should try my version of In-N-Out’s Flying Dutchman onion burger. It’s SO delicious!

How To Make A Big Mac Casserole At Home

Making this copycat recipe from McDonald’s is protein-packed and super tasty. In fact, it’s one of the easiest dinners you’ll ever make!

The best part? There aren’t any hard-to-find ingredients in this recipe like some other Big Mac copycats I have seen before.

Here are some of the key ingredients you will need to buy:

• Ground beef for the base of the casserole
• Eggs to act as a binder and help keep the casserole together
• Onions, garlic, and pickles to add flavor
• Heavy cream, mayonnaise, mustard, Worcestershire sauce for richness
• Sugar-free ketchup to provide that classic Big Mac flavor without the carbs!

Tip: Use my recipe for homemade keto Worcestershire sauce to make this casserole even more keto-friendly!

A Note On Ground Beef

I like to use 80/20 ground beef as it has enough fat to keep the dish moist. As a keto eater myself, I know that many of you are looking for dishes low in carbohydrates and rich in fats. This recipe definitely fits that bill!

But if you’re more comfortable using turkey or chicken instead of beef, go ahead. Just make sure you choose fattier cuts so that the dish isn’t too dry.

Tip: If you have some leftover ground beef, check out my Mexican Zucchini and Ground Beef Skillet for another delicious and easy dinner idea.

How to make Keto Big Mac Sauce

Whipping up homemade Big Mac sauce is a breeze! Just mix mayo, dill pickle relish, mustard, sugar-free ketchup, white vinegar, onion powder, garlic powder, salt, and pepper in a small bowl.

Stir it all together until it’s well blended. Adjust the seasonings to suit your taste!

Tip: Make a batch of this delicious sauce and store it in an airtight container in the fridge for future use on burgers or sandwiches. It’s also great as a dip for veggies or chicken nuggets!

Variations and Substitutions

• Dill pickles: If you don’t like dill pickles, feel free to use sweet or bread-and-butter ones instead! And if you hate pickles altogether (weirdo!), omit them altogether.
• Cheddar cheese: You can also mix in other cheeses, like American or Swiss, for a slightly different flavor.
• Eggs: If you’re allergic to eggs or just don’t like them, you can replace them with a flax egg or leave them out completely. The texture will be a little different, but it will still taste delicious.
• Big Mac Sauce: If you’re short on time, you can use store-bought Thousand Island dressing instead of making the homemade Big Mac sauce. Just make sure to check for added sugars and carbs.

Make Ahead and Storage Tips

This casserole is perfect for meal prep! You can make it ahead of time and store it in the fridge for up to 3 days. Just reheat in the oven at 350°F (175°C) until warmed through.

You can also freeze this casserole for longer storage. Just assemble it in a freezer-safe dish and freeze it before baking. When you’re ready to eat, thaw in the fridge overnight and bake as directed in the recipe.

Love This Keto Big Mac Casserole? Try These Recipes!

Looking for more delicious keto beef recipes? Check out a few of these favorites:

Recipe

Keto Big Mac Casserole

Get your burger fix without the bun or carbs with this Keto Big Mac Casserole. It’s got all the good stuff—juicy beef, creamy cheese, tangy pickles, and that classic homemade Big Mac sauce.

Prep Time:10 minutes mins

Cook Time:30 minutes mins

Course: Main Course

Cuisine: American

Diet: Gluten Free

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Instructions

• Preheat your oven to 350°F (175°C).

• In a large skillet over medium heat, cook the ground beef until browned. Drain any excess fat.

• Add the diced onion and minced garlic to the skillet. Cook until the onion is translucent.

• Stir in the chopped pickles and 1 cup of the shredded cheddar cheese. Mix well and spread the mixture evenly in a greased baking dish.

• In a bowl, whisk together the eggs, heavy cream, mayonnaise, mustard, Worcestershire sauce, sugar-free ketchup, salt, and pepper.

• Pour the egg mixture over the beef mixture in the baking dish. Sprinkle the remaining 1 cup of shredded cheddar cheese on top.

• Bake in the preheated oven for 30-35 minutes, or until the casserole is set and the cheese is bubbly and golden.

• While the casserole is baking, prepare the Keto Big Mac Sauce. In a small bowl, combine mayonnaise, dill pickle relish, mustard, sugar-free ketchup, white vinegar, onion powder, garlic powder, salt, and pepper. Mix until well combined.

• Once the casserole is done baking, remove it from the oven and let it cool slightly.

• Top the casserole with shredded lettuce, diced tomatoes, and sliced pickles.

• Drizzle the Keto Big Mac Sauce over the top of the casserole.

• Serve immediately and enjoy your delicious keto Big Mac casserole!

Notes

• Serving Size: 1 serving = 1.5 cups

Low Carb Sweeteners | Keto Sweetener Conversion Chart

Nutrition

Calories: 698 | Carbohydrates: 6g | Protein: 33g | Fat: 60g | Saturated Fat: 24g | Polyunsaturated Fat: 10g | Monounsaturated Fat: 19g | Trans Fat: 1g | Cholesterol: 258mg | Sodium: 688mg | Potassium: 479mg | Fiber: 1g | Sugar: 3g | Vitamin A: 871IU | Vitamin C: 3mg | Calcium: 338mg | Iron: 3mg

Additional Info

Net Carbs:
5
g

|

% Carbs:
2.9
%

|

% Protein:
19.1
%

|

% Fat:
78
%

|

SmartPoints:
25

Values

Array
(
    [calories] => 698
    [carbohydrates] => 6
    [protein] => 33
    [fat] => 60
    [saturated_fat] => 24
    [polyunsaturated_fat] => 10
    [monounsaturated_fat] => 19
    [trans_fat] => 1
    [cholesterol] => 258
    [sodium] => 688
    [potassium] => 479
    [fiber] => 1
    [sugar] => 3
    [vitamin_a] => 871
    [vitamin_c] => 3
    [calcium] => 338
    [iron] => 3
)

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.

Copyright

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