Reference: http://mufti.af.org.sa/ar/content/المرأة-وهي-تطبخ-في-عبادة-لله
Question: The Muslim woman generally spends most of her time in the kitchen, busy preparing various types of food, so [as a result] she misses out on taking advantage of the time during the month of Ramadhaan [to increase in the worship of Allaah]. So do you have any advice for the Muslim woman [in this regard]?
Response: Her service to her home is an act of worship, and fulfilling the requirements of her home and her children is [all] an act of worship. So [whilst she is engaged in running her home] she is [actually] engaged in the worship of Allaah. So she can [also] take advantage of her time to engage in the remembrance of Allaah – even if it is while she is preparing the food, because that is permissible; and All Praise is due to Allaah [alone].