Spread the softened butter on one side of each slice of bread.
Turn the slices over and spread the cranberry sauce on the unbuttered side of all four.
Heat a large skillet with a lid over medium-low heat.
Lay two slices butter side down in the skillet. Layer on the brie, the turkey and the bacon, then top with the remaining two slices, cranberry side down and butter side up.
Cover and cook for 4 to 5 minutes, until the bottom is deep golden and the brie has started to melt.
Carefully flip with a wide spatula, cover again and cook 2 to 3 minutes more, until the second side is golden and the brie is soft all the way through.
Slice in half and serve immediately.