Make some homemade pesto, (vegan cheese), basil, watercress, pine nuts, walnuts. Then just freeze. Cook some GF pasta to go with it.
Veggie chilli - lentil, red pepper, onion, beans of any variety, sweetcorn (add any other veg you have), passata, chilli, cumin, vegan chocolate. Then just cook a jacket or rice to go with it.
Bolognaise. You can go half and half mince and lentils to reduce cost.
Sweet lamb casserole. Slow cook diced lamb with red onion, redcurrant sauce, pancetta and whatever veg you fancy eg pepper.
Cottage pie (use non dairy milk)
Chicken casserole. Diced chicken, baby mushrooms, sweet corn red pepper, passata and sun dried tomato paste.
Beef casserole. Slow cooked beef, onion, carrots, bacon, celery, red wine.
Also Becky Excell has loads and loads of GF recipes where she makes suggestions to adapt them to being dairy free or vegan or low fodmap.
glutenfreecuppatea.co.uk/