Heat broiler on high, with rack in the second position about 6 inches from the flame. Line a half-sheet pan with Reynolds Wrap® Non-Stick Foil.
In a medium bowl combine the turkey with celery, mayonnaise, cranberries and red onion, and stir until combined.
Arrange the toasted bread on a baking sheet and divide the turkey salad evenly among slices, then top each with 1 ounce of cheese.
Broil about 6 inches from the flame until the cheese is golden and bubbling, about 2 to 3 minutes, keeping a close eye on it to avoid burning.