In a large bowl, mix Ground Beef, burger seasoning, Worcestershire sauce, and BBQ sauce together until well combined.
Line a 4-inch wide lid with plastic wrap. Add a few spoonfuls of hamburger mixture to the lid and fold plastic wrap over the top to press and mold the burger patty. Unwrap from plastic wrap and place onto a plate or platter. Continue this process until you have created 8 patties, about 1/4 pound each, 1/3-1/2 inch thick, 4 inches across.
Cover and refrigerate for about 1 hour. (This will help the burgers keep their shape on the grill)
While burgers are resting, make the secret sauce: stir mayonnaise together with ketchup, pickles, pickle juice, ground pepper, and garlic powder. Place in refrigerator.
Also, prep your burger toppings: slice tomatoes, wash and tear lettuce, slice the onion, etc.
To grill, place each burger onto preheated grill. Cook 3 minutes on one side and then flip. Add cheddar cheese slices on each patty, cover and cook 1 minute. Turn grill off and then continue cooking another 3 minutes or until burgers register 160 degrees F.
Stack two burgers* together and place onto hamburger buns. Add plenty of secret sauce and any other desired toppings. Enjoy!
*To lighten up the recipe, make with only one lean beef patty.