It's important to follow the correct ratio of vegetables to egg mixture to ensure that too much liquid isn't leached from the vegetables into the quiche. Use no more than 1 1/2 cups of chopped vegetables for this crustless quiche. Also, be sure to pat the roasted peppers dry of any excess moisture, as this will prevent your quiche from becoming soggy. If you use other vegetables, it's best not to use watery ones like zucchini. Finally, adding in a bit of flour helps to thicken up the egg mixture and absorb some of the excess liquid, so don't skip this step!