How do I prevent a soggy bottom?
There are several tricks to ensure that the base of your savory tart is cooked through. One method that always works is blind baking the base, which gives it a head start before the quiche filling goes in. The filling always cooks faster than the base. You can read more about blind baking here. You can use pie weights or dry beans to blind bake the quiche.
If you often have trouble cooking the base, it helps to cover the top of the quiche and place it as far down as possible on a closed baking sheet (to conduct heat). After the specified baking time, remove the quiche from the tin and bake it again for 10–15 minutes so that both the top and bottom are browned and cooked through.
This last step always works very well for me. I usually bake a quiche well in advance, and this is how I reheat it. I bake it without the pan, directly on the baking tray with parchment paper underneath. The result is always an evenly browned quiche with a delicious flaky crust.