Preheat oven to 350°F. Grease and lightly flour 13×9-inch baking pan.
Prepare grill for medium indirect heat cooking.
Cook rice according to package directions.
Preheat broiler. Spray rack of broiler pan evenly with cooking spray.
Cook sweet potatoes in enough water to cover for 30 to 35 minutes or until potatoes are tender around the outer edges but slightly firm in center.
Combine cream cheese, cranberries, mustard and cinnamon until well blended. Spread evenly onto bread slices.