A method of controlling a microwave oven, in which the microwave oven
includes a cooking chamber for containing food therein, a cooling fan
which circulates air, a magnetron which generates microwaves and a
humidity sensor which senses humidity of the cooking chamber. Cooking
instruction(s) may be preset or set manually by a user. A first cooking
operation is performed while preventing water from boiling off/to overflow
by controlling an output power of the magnetron according to the set
cooking instruction(s). A time required to perform a later cooking is set
according to a time required to perform the first cooking operation. A
second cooking operation is performed for the later cook time while
controlling the output power of the magnetron to reduce the overall cook
time of the food.