Bowser's Sourpuss Bread

"You know what they say: All toasters toast toast!"

- Mario

Bowser's Sourpuss Bread is a brand of bread that is used in Hotel Mario, in which it is being toasted by too many toasters in Roy's HardBrick Hotel, where it causes electrical flickering. As well as its name being on the product in green text, the blue packaging includes a distinct Bowser logo, implying that Bowser's forces manufacture this bread.