Place baking sheet on middle rack and preheat oven to 350°F. Remove plastic film from container. Heat macaroni and cheese in container on baking sheet until browned and bubbly, 15-20 minutes.
Remove plastic film. Heat macaroni and cheese in container, on high, until hot, 2-3 minutes.
*Note- Do not heat in toaster oven; discard all packaging and transfer to toaster oven safe bakeware first.