Preheat your grill or skillet over medium-high heat. Form the ground beef into four equal-sized patties, gently pressing the centers to help them cook evenly. Season each patty generously with salt and pepper.
Place the patties onto the hot grill or skillet. Cook for about 4-5 minutes per side until they develop a nice brown crust and reach your desired level of doneness. During the last minute, lay a slice of cheddar cheese on each patty to melt.
While the patties are cooking, slice the onion very thinly. Use part of the onion to create wild hair by spreading small strips around the top of each burger once assembled.
Toast the burger buns lightly on the grill or in a toaster until golden and crisp. This helps them hold together when assembling the monster faces.
Spread a bit of ketchup inside the top and bottom buns to create gruesome mouths and bloody wounds. Place each cooked burger patty onto the bottom buns.
Use small pieces of cheese to form eyes on each burger, placing them on the melted cheese on top of the patties. Add crispy fried onions around the cheese eyes to resemble wild hair or creature's features.
Position additional pieces of crispy fried onions and sliced onions around the faces to give the appearance of wild hair or scary textures. Add extra ketchup or condiments as needed for blood effects.
Cap each burger with the top bun and gently press down to secure all the toppings. Use a little ketchup or additional cheese for finishing touches if desired.
Serve the Monster Burgers immediately, allowing everyone to enjoy the playful, scary faces and delicious flavors. Perfect for a fun Halloween gathering or themed party.
