Yes, always cook the veggies first before adding them to the quiche custard. u003cbr/u003eu003cbr/u003eThe veggies will take much longer to cook than the custard base of the quiche, so you will always need to pre-cook them first.u003cbr/u003eu003cbr/u003eOtherwise, you may end up with semi-raw veggies floating inside the custard of the quiche.