Salt and pepper the potatoes.
Lay the sliced potatoes on one of the pieces of foil. Spread flat (just don’t leave them in a mountain).
Smash and chop 6 cloves of garlic very fine. Sprinkle the garlic over the top of the potatoes.
Cover it with cheese. All. Of. It.
Cut each stick of butter into about 8-10 slices. Toss all 20 or so slices around the top of the potatoes.
Cover the entire mess with the other sheet of foil, with the edge you sprayed with Pam down.
Pull the edges of foil together and fold twice around the entire perimeter, sealing the package well. You really need it sealed, because the potatoes are going to steam to cook.
Place on the cookie sheet and cook for one hour at 450.
If you have access to a grille, grill on high for 40 minutes.
Let sit for 10 minutes before tearing a hole in the top to release the steam.
These are the best fucking potatoes to eat with a thick slide of fried ham, a steaming wad of pulled pork, or a few slices of brisket. They go just as well with a skillet steak as they do anything.
Or, you can just eat them all by themselves.
Enjoy.