Preheat the oven to 400 degrees.
Tear sheets of foil for as many packets as you plan to make. Make them large enough to hold your ingredients.
Pat out burger to make 5 patties that are no more than 1 inch thick. Set aside.
Slice potatoes and onion in 1/4 inch thick rounds. Set aside.
Peel and shred or thinly slice carrots. I like to use the vegetable peeler for this. Set aside.
Cut butter into 1 tablespoon slices. Set aside.
Assemble each packet by placing a burger patty in the center. Add a pat of butter. Cover with slices of potatoes, onions and carrots. Sprinkle with salt and pepper to your liking. Add optional seasoning at this time.
Fold the foil over the mound of ingredients horizontally. Then fold up the ends so that everything is enclosed tightly.
Place the completed packets on a rimmed baking sheet and bake for approximately 1 hour. Check at 40 minutes. Cooking times varies with thickness of burger and veggies.
Carefully open the packets. They will be steamy. Serve and enjoy!