Preheat grill to 350 degrees
in a bowl combine the hamburger, egg, seasoning salt and garlic powder. Form into four patties, set aside.
In a large bowl combine the remaining ingredients exceptcheese slices. mix until combined.
Spray four 12" x 18" pieces of foil with nonstick spray. Place 1/4 of the vegetables in the center of the foil. Top with 1 beef patty. seal packets and place beef side up on the grill.
grill for 34-45 minutes or until potatoes and carrots are tender and the ground beef reaches 160 degrees F. i flipped mine over during the last 20 minutes of cooking.
When the packets are done open the top, hamburger patty facing up, and add a piece of cheese. CLose grill cover and grill 2-3 minutes or until cheese is melted.
these also can be made in the oven. simple preheat oven to 350 degrees place the foil packets, beef side up on a large baking sheet and bake 45 minutes or until vegetables are tender and the ground beef reaches an internal temp of 160 degrees F