The vast majority of what I cook is "bunch of veggies and some meat, put together in a pot and served over rice or pasta".
A savory mince is a really good basic one. Onion, garlic, mince meat, and as many of whatever veggies you want. I usually do carrot, potato (both parboiled), and zucchini, but nearly anything can fit. Peas, beans, broccoli could all be good. Then add diced canned tomatoes, and add pepper & worcestershire sauce to taste. Serve over rice or on bread. Replace the mince with pre-cooked & diced sausages for a variant.
A stir fry is an especially healthy variant of this theme. My usual is onion, garlic, diced chicken breast (preferably marinated beforehand), broccoli, capsicum (I like to buy the "lighthouse" packages with one of each colour and throw all three in), carrot, broccoli, cashews. Sprinkle pepper and soy sauce to taste, and serve over rice.
When I do spag bol, I add grated carrot and zucchini.