01 - Preheat your campfire, grill, or oven to medium-high heat (about 400°F). Allow the grate or oven to fully reach temperature before cooking.
02 - In a mixing bowl, combine the ground beef with garlic powder, onion powder, smoked paprika, salt, and 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, shaping each into a uniform ball.
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 potato 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 pepper.
06 - Flatten each portion of seasoned ground beef into a patty and place one on top of the vegetables in each foil packet. Drizzle each patty with ½ tbsp ketchup and a small amount of yellow mustard.
07 - Fold the foil up and over the contents to form tightly sealed packets. Crimp the edges firmly to ensure no juices escape during cooking.
08 - Place the sealed packets on the campfire grate, grill grates, or in the oven. Cook for 20 to 25 minutes until the beef is cooked through and the vegetables are tender, flipping the packets once halfway through the cooking time.
09 - Carefully open each packet, watching for hot steam. Place a slice of cheddar cheese on each patty and reseal the foil. Let rest for 2 additional minutes until the cheese melts.
10 - Serve directly from the packets or transfer to plates. Garnish with sliced pickles, chopped lettuce, sliced tomatoes, and additional condiments as desired.