i am either the best or worst person to answer this because i rarely eat breakfast BUT breakfast foods are my favorite type of food LMAO

tbh i don't think it's financially realistic for mob or reigen to be buying breakfast all that often so they probably cook! reigen is an okay cook (it's not one of his special moves) but he does like teaching mob to make different meals :) and sometimes the pots and pans float around like in a fairy tale or whatever. it's cute!!!

megumi cooks because he literally needed to learn how to do it to live and also because, extrapolating based on the recent Q+A, he is the closest thing gojo has to a sugar mommy in this regard. but when they buy it's gojo's treat (as it fucking should be lmao) :)