Easy Veggie Quiche Recipe With Feta Cheese This quiche recipe is made with red pepper, mushrooms and green onion, but they’re so flexible and literally, any veggie tastes good. Try broccoli, asparagus, spinach, tomatoes…they’re all delicious in a quiche.You can also cook your veggies ahead of time to save some time when you’re ready to make the quiche. Or, try my trick and make a quiche with all the leftover roasted veggies from the week. This is a particularly good idea on say, a Thursday night when you’re trying to clean out your fridge. I do suggest keeping some kind of onion or garlic as the base because they add flavor complexity to dishes. Yellow onion, green onion, red onion, shallots, garlic or leeks all substitute well for one another and they’re all incredibly beneficial for gut health, too. In fact, onions, garlic and leeks are three of the foods that are listed in my free guide.