Roast/airfry frozen med veg with spices (fajita mix/Cajun/paprika/harissa) for 15 mins, when cooked pour in cous cous and stock, cover and leave till cous cous is soft, fry some halloumi to go with and siratcha and natural yoghurt on top.
Can of black bean, can of sweetcorn, jar of salsa, sprinkle of fajita mix, cooked quinoa mixed in, makes loads, keeps well, good hot or cold. Guacamole or plain avo on top if you like
Red pepper, spring onions and feta mixed through cous cous with pesto is another that can be made ahead and served hot or cold.
Jacket potato with cheese, onion and salad cream
If you like soup then adding soup mix or brown rice to it really fills you up.
Half a pack of frozen casserole veg mix cooked in stock with thyme, S&P, a bay leaf and a cup of brown rice makes me soup for three lunches. Can add cumin and curry powder before you reheat a bowl if getting bored…