01 - Preheat your campfire, grill, or oven to medium-high heat (approximately 400°F). Allow the grate or oven to fully come to temperature before cooking.
02 - In a mixing bowl, combine the ground beef with garlic powder, onion powder, smoked paprika, a generous pinch of salt, and black pepper. Gently mix just until the seasonings are evenly distributed—avoid overworking the meat.
03 - Divide the seasoned beef mixture into 4 equal portions and shape each into a flat patty, roughly ½ inch thick.
04 - Tear 4 large sheets of heavy-duty aluminum foil, approximately 12 inches per side. Brush the center of each sheet with olive oil to prevent sticking.
05 - Arrange thinly sliced potatoes in the center of each oiled foil sheet. Layer onion slices, red bell pepper strips, and mushrooms on top of the potatoes. Season the vegetables lightly with salt and pepper.
06 - Place one seasoned beef patty on top of the vegetable bed in each packet. Drizzle each patty with ½ tablespoon ketchup and a small squeeze of yellow mustard.
07 - Fold the foil up and over the filling, crimping the edges tightly to form fully sealed packets. Ensure there are no gaps to prevent juices from leaking during cooking.
08 - Place the sealed packets on the campfire grate, grill, or in the oven. Cook for 20 to 25 minutes, flipping once halfway through, until the beef is cooked through and the vegetables are fork-tender.
09 - Carefully open each packet, watching for hot steam. Place a slice of cheddar cheese on each patty, then reseal the packets and cook for an additional 2 minutes until the cheese is melted.
10 - Serve directly from the foil packets or transfer to plates. Garnish with sliced pickles, chopped lettuce, fresh tomato slices, and extra condiments as desired.