Crispy Low Carb Onion Bun Big Mac

For the bun: Layer shredded cheese, two onion slices, and more shredded cheese on a parchment-lined baking sheet. Bake at 400°F (200°C) for 8-12 minutes, or until crispy and golden brown. 

For the patty: Mix 1 tablespoon of mustard with the ground beef, salt, and pepper. Form into a patty and fry for a few minutes on each side until cooked through. 

For the Mac sauce: Mix 2-3 tablespoons of mayo with 1 tablespoon of mustard, 2 teaspoons of relish, and a pinch of paprika. 

Assemble your burger with the crispy onion buns, beef patty, and Mac sauce. Enjoy!