One other great thing for my freezer (following on from the great tip about plain tomato sauce - I completely forgot how great that is for just adding leftover cooked chicken, some fried bacon lardons or grilled sausages or rashers chopped up, or just sliced and fried mushrooms!) is roast veg.
I often make a batch if I am doing a roast anyway, freeze some uncooked for easy "midweek" roasts (or post-baby) with a couple of baked potatoes (or roast if you can be bothered to peel), and a lamb chop/shank or chicken joints (drumsticks, oyster thighs or part boned breasts) in particular as the meat part. Or alongside a larger joint to get leftovers - but everything just slides into the oven to be ignored. And cooked leftovers are great to freeze too, to either have as the veg alongside a grilled chop, sausage, chicken, or steak with some potato (plain boiled, baked, mashed - anytype!).
Dice your veg into similar sized chunks - about 1-2 cm is great. You need onion and garlic, and then whatever you have: peppers, mushrooms, courgette, aubergine, tomatoes are great in it. Season with salt, pepper, dried thyme or dried oregano or dried basil (or a combination), a slug of balsamic vinegar and some olive oil. Leave at least 20 minutes (can keep in a Ziploc bag in the fridge for 2-3 days, or as I said, freeze some still raw). Roast at 180 for roughly 20-30 minutes, until nice and soft and cooked through. I tend to cook a large tray with my roast, as the oven is on anyway, and freeze a few single person/meal portions to add to tomato sauce and some meat/mushrooms or alongside another meat and potatoes type meal.
Another veg thing I have prepped in the freezer is roasted root veg. LArger chunks of red onion, carrot and parsnip, with some butternut squash or similar if you have it. Season with salt, pepper, thyme, rosemary and olive oil. Again, leave at least 20 minutes before cooking - it freezes great uncooked, but once cooked I tend to make any leftovers into soup with some veg stock and just blitz - but that soup does freeze well too.
When b'fing, I found I needed to sit with a few things in easy reach. Muslin. Sudoku book, pencil, tv remote. A large mug of tea, a pint of water, and a stack of 3 fig rolls. (The liquids were always much needed, you get quite thirsty - but I found I needed some food too and fig rolls were a little bit treat-ish but not as bad as chocolate biscuits and had the added benefit of improving my fibre intake (quite important!) and counting towards my fruit/veg intake too).