You fill a small or medium-sized bowl with some yummy, magical muesli (milk not included). After eating the müsli you gain 2d4 temporary hit points, in addition, you also gain resistance against non-magical piercing damage for 1 hour, so your chance of surviving those breakfast stabbings gets a little higher. The temporary hit points last until depleted, they are replaced with other temporary hit points or until you finish a long rest.