Stuffed portobello mushrooms. - Remove stalks and process to "mince" or chop finely. Mix stalk "mince" with vegan cream cheese, a chopped garlic clove, a small chopped red pepper. Fill mushroom cups with mixture. Put on foil lined dish, add a little water to dish, and bake for 20-25 minutes 180 degrees centigrade. Really tasty.
You can do the same with stuffed red peppers, chop button mushrooms instead and leave red pepper out of the filling mixture
Or simmer a mass of small plum tomatoes (or tinned tomatoes) with chopped garlic, onion, chopped pepper, mushrooms, herbs and a large squirt of tomato paste for an hour. If a bit sharp add a couple of teaspoons of sugar near the end. You can serve this with pasta (and vegan "parmesan" available in supermarkets.) You can also use it to make a vegan shepherds pie, a vegan lasagne (use vegan pasta). You can also add chickpeas, beans or lentils if these are liked.
Alternatively buy a jar of vegan pesto, steam chopped pepper, onion, mushrooms, cook pasta, stir vegs and pesto through the pasta.
Tinned pulses are useful as are the packets of microwave grains in the supermarkets They are also good for use as a stuffing for peppers or mushrooms. adding a few herbs and maybe a few steamed chopped vegs.
Good luck