My quiche go-to is usually spinach (or silverbeet aka chard), onions, and then whatever I have of tomatoes, mushrooms, and red capsicum. If pushed though any cookable-green should work: cabbage, bok choy, broccoli, etc.

For pizza tonight I put on onion, sausage slices (in lieu of ham or salami...), tomato, silverbeet, cheese, seasoned with fennel seeds and thyme. (The tomato, silverbeet, fennel and thyme are from my garden. I have a jar full of about 2cups of fennel seeds so expect to be using them a lot....)