Add the remaining ingredients. Add the cream cheese, sugar-free ketchup, yellow mustard, and Worcestershire sauce and stir to combine. Transfer the mixture to a baking dish.
Prepare the egg mixture. Use a bowl to combine the eggs, heavy cream, and hot sauce. Pour the egg mixture over top of the beef. Sprinkle it with shredded cheddar cheese. Use an extra serving of cheese if you love cheese!
Prepare the sauce. Add the mayonnaise, sugar-free ketchup, yellow mustard, diced pickles, white vinegar, onion powder, and paprika to a bowl and mix to combine.
Finish it off. Remove the casserole from the oven and top with the Big Mac sauce, shredded iceberg lettuce, diced onion, sliced pickles, and sesame seeds. Serve warm.