Grilled Brioche "S'mores"

Over a heated, medium-low grill, toast the croissants for 1 minute. Remove from the grill and spread 2 tablespoons marshmallow cream and 1 chocolate square onto each croissant. Sprinkle with coarse salt and place the top slice of the croissant back to make a sandwich. Place the toasts back on the grill. Close the grill cover and allow the chocolate to melt, about 30 to 45 seconds. Remove the toasts from the grill and serve warm.