I would be cleaning my oven more often ( or rather feeling guilty for NOT cleaning it!) because cooking chicken in it would have dirtied it. Tupperware would not answer for freezing chicken portions either because there would be lots of air pockets around the chicken and it would suffer from freezer burn.
As I recall it the OP mentioned she was having to cook every night. My suggestion of cooking a batch of food doesn't suggest long term freezing, and that's not what I had in mind. I sort of imagined the op maybe cooking about 4 pieces of chicken, or whatever, the maybe eating them over a week to 10 days, something like that. I can't imagine there being a massive degradation in that time, even if it was something she fancied considering.