بسم الله الرحمن الرحيم
(Fatwa: 872/713/B=06/1435)
It is lawful to cook food, prepare breakfast and eat them in the state of janabah (impurity), though it is not good to do so. Hence one should cook as well eat food and breakfast after ghusl.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband
