As a married working woman I think it's fine to expect a working woman who cooks as long as you take care of other works completely and not forcing her to cook when she is really busy.
I focus more on work, I cook too but the rest of the household work is handled by my husband. We don't follow it as a rule if he sees me busy working he would cook. When I see him busy I clean. Marriage life is all about balancing and supporting each other. It's not about 50/50.
Just curious on why can't you cook? Cooking is the basic skill which needs to be learnt by everyone irrespective of gender.