take 2 slices of your favorite bread (I use wheat) and butter each slice on one side.
on the non-buttered side put very light mayo, then spread cream cheese on it.
put your favorite roast beef slices in between, cheese to the inside, and grill in a pan over medium heat until golden brown on each side.
Wow. That is nearly identical to one of my favorites... only instead of sliced beef, I use a really thick slice of vidalia onion(about 1/2" thick slice) when they are available. Don't laugh... it's really tasty.