Combine ingredients for the Big Mac Sauce. Stir until well combined. Season to taste and then set aside in the fridge for 30 minutes.
To prepare your middle bun (aka the Club), use a serrated knife and shave off just the bottom of the extra bottom bun.
Press or form your burger patties so they match the circumference of your buns.
Grill buns in a bit of oil or vegan butter (or do a dry toast) until lightly golden brown. Set aside (ideally on a wire rack so they don't get soggy).
To the same pan or griddle, over medium - medium high heat, add a little oil and then add the burger patties to the pan. Season with salt and pepper and grill for about 3 minutes. Once patties are browned, give 'em a flip!
After you flip the patties, add a slice of vegan cheese to each one and cover with a melting dome. You can add a little water before covering to steam the cheese too!
Once Cheese is melted, assemble as follows; Bottom Bun, Sauce, Lettuce, Burger Patty, Onions, Middle Bun, Sauce, Pickles, Lettuce, Burger Patty, Sauce, Top Bun.
ENJOY!