Next get a cast iron (or pan capable of high heat) skillet up to medium heat. Brush some vegan butter or oil on your buns and then toast them until golden brown. Remove from pan and let them rest on a wire rack so they don't steam.
Next, get the pan smoking hot, add a little bit of oil to the pan, spread it around with your spatula, then add a 3 - 4 oz. ball of plant-based meat. Smash it with a sturdy metal spatula or burger iron to about 1/2 inch thick.
Cook for around 2 minutes. You can check and see if there's a deep brown crust forming where the patty is touching the pan, once you see that, use your spatula to free it from the pan. It will wanna stick, but if your cast iron is seasoned well, it'll let go with enough coaxing.
Flip the patty, add a piece of vegan cheese, squirt a few drops of water, and then cover the pan immediately to steam and melt the cheese. Cook until the cheese has melted, about 1 minute. Remove from the pan.
Dress the bottom bun with Shack Sauce, add the smashed cheeseburger, a few slices of tomato, season the tomatoes with salt and pepper, then some green lettuce, more sauce on the top bun, and ENJOY!