Preheat oven to 350 degrees.
Put all ingredients into an oven-safe dish and whisk together well.
Bake for 20-30 minutes or until top is evenly browned.
This is the quickest oven-baked frittata to prepare. Normally I would add flour and milk to a dish like this, but on the day it was made, I was in such a hurry there was no time to think about accurately measuring the two. It resulted in one of the fluffiest and most delicious frittatas we have ever had - simplicity at its best. Use whatever veggies you have and make a meal of it with soup or a side salad. If you have leftovers, cut squares of the frittata and place on your favorite bread for a tasty panini and a cost-effective brown bag lunch!