My first apple pie had a bottom crust you could see through. My grandmother called it wet cardboard and she was being polite. The filling was fine, the top crust was fine, but the bottom was a pale, soggy mess that stuck to the pan.

The fix turned out to be embarrassingly simple. Your oven already has the tool you need, you just are not using it.

Preheat the Baking Sheet

Put a heavy baking sheet on the middle rack before you turn the oven on. Let it heat up with the oven. When the filled pie goes in, set it directly on that hot sheet.

The hot metal pushes heat into the bottom of the pan right away, so the crust starts setting the moment the pie lands. Without it, the bottom crust sits in cold dough while the top bakes, and the filling soaks in before the crust can firm up.

Use a Glass or Ceramic Pie Dish

Metal conducts heat faster than glass, but glass still does a better job than a thin disposable tin. I bake all my pies in a glass dish now and the bottom crust comes out golden instead of pale.

Blind Bake for Wet Fillings

For quiches, custards, and anything with a lot of liquid, blind bake the crust first:

1. Line the crust with foil and fill it with pie weights or dry beans
2. Bake at 400F for fifteen minutes
3. Remove the weights and foil, then bake five more minutes
4. Fill and finish baking

One more habit that helped me: brush the bottom crust with a thin layer of beaten egg white before adding the filling. It forms a barrier that keeps the liquid out.