In a mixing bowl, gently combine ground beef with minced garlic, salt, and black pepper. Handle the meat lightly to keep it tender.
Divide the seasoned beef into four equal portions and shape each into a large, flat patty, about half an inch thick, with slightly jagged or uneven edges for a spooky look.
Heat your grill or skillet over medium-high heat. Place the patties on the hot surface and cook for about 4–5 minutes on each side, until they develop a nice brown crust and are cooked through.
While the burgers cook, prepare your toppings: slice the tomato thinly, shred the lettuce, and gather colorful candies or edible decorations for eyes and mouths.
Once cooked, transfer the beef patties to a plate and let them rest briefly for a minute.
Toast the burger buns lightly on the cut sides if desired, then assemble each burger by placing a patty on the bottom bun.
Decorate the burgers with shredded lettuce, tomato slices, and add candy eyes or edible decorations to create spooky monster faces. Use cheddar cheese slices to make eyes or mouths if desired.
Top with the remaining bun halves and press gently to secure the decorations.
Serve the Halloween Monster Burgers immediately, watching as the playful and ghoulish designs delight everyone at the table.