01 - Preheat your campfire, grill, or oven to medium-high heat (approximately 400°F). Allow the heat source to stabilize before cooking.
02 - In a mixing bowl, combine the ground beef with garlic powder, onion powder, smoked paprika, salt, and black pepper. Mix gently just until the seasonings are evenly distributed, being careful not to overwork the meat.
03 - Divide the seasoned beef mixture into 4 equal portions and set aside.
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 potato slices in the center of each oiled foil sheet. Layer onion, bell pepper, and mushrooms evenly over the potatoes. Season the vegetables lightly with salt and black pepper.
06 - Flatten each portion of seasoned ground beef into a patty and place one on top of the vegetables in each foil packet.
07 - Drizzle approximately ½ tablespoon of ketchup and a small amount of yellow mustard over each beef patty.
08 - Fold the foil up and over the contents to form tightly sealed packets, crimping the edges firmly to prevent any leaks during cooking.
09 - Place the sealed packets on the campfire grate, grill grates, or in the oven. Cook for 20 to 25 minutes, flipping once halfway through, until the beef is fully cooked through and the vegetables are tender.
10 - Carefully open each foil packet, watching for hot steam. Place a slice of cheddar cheese on each patty and reseal the packets. Return to the heat for 2 additional minutes to allow the cheese to melt.
11 - Serve the hobos directly from the foil packets or transfer to plates. Garnish with sliced dill pickles, chopped lettuce, fresh tomato slices, and additional condiments as desired.