You can roast broccoli, green beans, peppers, aubergines, courgettes, peppers etc so they're good veg.
Plus all the roots: carrots (take longer than everything else so cut up smaller), parsnips, squash, beetroot, radish (!), potatoes obvs
Then do oven baked chicken / fish / pork / roast beef / gammon / sausages / bacon / black pudding
We've started using Green Chef recipe boxes and they do a lot of 'topping sauces' for oven baked meat to jazz it up ie:
Chimmichuri - garlic, lime, chilli, coriander, parsley, chilli flakes, olive oil blitzed in a mixer
Salsa verde - chives, parsley, spring onion, whole grain mustard, olive oil
Crumbled blue cheese & walnuts / hazelnuts on pork
Asian - chopped peanuts, chilli, lime, sesame seeds, olive oil
They also do a lovely cavalo Nero salad just massage leaves in oli (remove stalks) then add warm mixed roasted root veg with dressing of whole grain mustard, red wine vinegar, lemon juice and olive oil. Then finish with walnuts and blue cheese or feta. Gorgeous with simple
Baked chicken / pork / fish.