Every 2 or 3 weeks I make a load of oat bars (oats, mashed banana, peanut butter, raisins and honey) and bread pasties ( pasties but made with bread dough instead of pastry abd filled with whatever I have in the fridge).
I wrap them individually and freeze.
I then have lunches ready for work. I just take an oat bar and a pasty out of the freezer in the evening and take to work the next day with some fruit and a box of salad veg.
It has saved me so much hassle after work when I'm tired and just want to sit down!
I also make a massive load of chilli com carne every so often and freeze for easy dinners after work.