An apparatus and method are provided for steam injection heating of a bulk food product. When cooking scrambled eggs, the method includes providing a predetermined amount of liquid uncooked egg. A predetermined amount of water is injected into a heated cavity to form a quantity of steam that is sufficient to cook the predetermined quantity of liquid uncooked egg when injected therein. The liquid egg may be liquid pasteurized whole egg. The predetermined amount of the food product may be a single serving, or integer multiples thereof. When heating a serving amount that is an integer multiple of at least two times the amount of a single serving, the predetermined quantity of water is injected in pulses. The number of pulses is the same as the integer multiple of servings being heated, and each pulse contains substantially equal amounts of liquid water.