Stir sugar with cinnamon until combined; set aside. Preheat your George Foreman Grill for 5 minutes with the lid closed. Meanwhile, slice croissants in half without cutting all the way through. Spread cream cheese evenly on bottom half of croissant and sprinkle 1 tsp cinnamon sugar over top. Cap with top half of croissant.
Place stuffed croissants on grill and cook for 2 to 3 minutes or until filling starts to ooze. Dust croissant with more cinnamon sugar.
Tip: Serve with mixed berries, if desired.