Oven: Preheat oven to 400°F. Wrap stollen (whole loaf or portion) in aluminum foil and bake until just warmed through, about 7 to 15 minutes, depending on size. Remove from oven and unwrap foil, dust with powdered sugar, slice and serve.
Toaster Oven: Preheat toaster oven to 350°F. To heat a slice of stollen, use serrated knife to cut bread into 1/2"-thick slices. Place in toaster oven and cook until just warmed through and slightly browned. (To heat a larger piece, see instructions for oven.) Dust with powdered sugar, slice and serve.
Microwave: To heat a slice of stollen, use serrated knife to cut bread into 1/2"-thick slices. Place in microwave and cook until just warmed through, about 10 seconds. To heat a larger piece or whole loaf, heat at 15-second intervals until just warmed through. Dust with powdered sugar, slice if needed and serve.

Dresden Stollen, Serves 4-6