Line a small sheet pan with parchment paper. Set it aside.
To make the burger patties: Place ground beef, Worcestershire sauce, garlic powder, paprika, salt, and black pepper in a large bowl. Mix until well combined. Divide it into 4 equal portions and flatten them into ¾-inch thick burger patties that are about 3 inches in diameter. Make a dent in the middle of each patty using a small flat-bottomed ramekin (please refer to how-to images for a visual).
Transfer patties onto the prepared baking sheet. Cover them with plastic wrap and freeze for 30 minutes.
To cook the bacon in the oven: Preheat the oven to 400 degrees Fahrenheit. Line turkey bacon slices on the wire rack (or on a parchment-lined baking sheet) making sure not to overlap. Bake in the preheated oven for 10 minutes. Remove from the oven, flip them and bake for another 5 minutes. Set them aside.
To make the guacamole: Mix together garlic, lime juice, and salt in a large bowl. Cut the avocados in half and scoop out the avocados and place them into the bowl. Using the back of a fork (or a potato masher) mash the avocados until it reaches to your desired level of chunkiness. Taste for seasoning and add in if necessary.
To cook the burgers: Preheat a gas grill* to 400 degrees F. Dip a wad of paper towel into vegetable oil and then generously wipe the grates. Place beef patties on the grill and cook for 4-5 minutes. Flip the burgers and cook for another 4 minutes or until a thermometer inserted in the middle registers 125 degrees F for medium-rare, 130 degrees F for medium, and 155-160 degrees F for well done.
When they are done, move them from the direct heat and top each burger with a slice of cheese, if using. Let the residual heat melt the cheese for 45 seconds to a minute.
Transfer the burgers onto a plate, cover them with foil and let them rest for 5 minutes.
If preferred, while the burgers rest, lightly toast buns (off direct heat) on the grill, for a minute or two.
To assemble the burgers: Place the bottom bun on a plate. Line it with avocado, tomato slice, burger meat, bacon, and a lettuce leaf. Put the top bun on. Repeat with the rest of the burgers. Serve!