Why Did My Pie Crust Shrink

You fluted a beautiful edge, and after blind baking the shell came out short, with the sides sagging down the pan and the crimp half gone. Shrinking is the dough pulling back toward its original shape. Gluten that was stretched during rolling acts like a rubber band; once heat relaxes the fat that held it in place, it contracts.

The good news is that shrinkage is almost entirely preventable. It comes down to a few habits: work the dough gently, let it rest cold both before and after it goes into the pan, never stretch it to fit, and support the sides with enough weight while the fat melts and the structure sets.

What actually makes dough contract

When flour meets water and is worked, gluten forms. A little gluten makes the crust hold together; a lot makes it elastic. Rolling stretches that network, and if it has not relaxed before baking, the strands spring back as soon as the fat melts and stops holding them in place.

Two other things make it worse. Extra water gives gluten more to work with, so a very wet dough is more elastic. And warm dough loses its shape quickly in the oven because the butter melts before the flour has set, so the sides slide down before they can firm up.

• Overworked or kneaded dough
• More water than the dough needed
• Not enough resting time, especially after rolling
• Dough stretched to fit the pan

Mixing and resting habits

Add water a tablespoon at a time and stop when the dough just holds together when squeezed. For a typical single crust made with 160 g (1⅓ cups) of flour, that is usually 3 to 5 tbsp of ice water. Press the dough into a disk instead of kneading it.

Wrap the disk and refrigerate it for at least 1 hour, or up to 2 days. After rolling and fitting, chill the shell again for 30 minutes, or freeze it for 15 to 20 minutes. The second rest matters as much as the first, because rolling re-stretches the gluten you just let relax.

Fitting the dough without stretching it

Roll the dough about 5 cm (2 in) larger than the pan all around. Drape it over the plate, then lift the edges with one hand while you press the dough down into the corner with the other. The dough should slump into place loosely. If you pull the edge to cover the rim, you have stretched it.

Leave a generous overhang and trim to about 1.5 cm (½ in) past the rim, then fold that under and crimp it so the edge rests on the rim of the pan. A crimp that hangs over the rim, or is anchored to it, has something to hold on to. A thin edge trimmed flush with the pan has nothing to stop it sliding.

Weights and the blind bake itself

Line the frozen shell with parchment or foil, pressing it into the corners, and fill it to the top with ceramic weights, dried beans or granulated sugar. Weights that only cover the bottom leave the walls unsupported, and those are what slump.

Bake on a lower rack at about 200°C (400°F) for 15 to 20 minutes, until the edges look dry and just starting to color. Lift out the liner and weights carefully, prick any bubbled areas, and continue baking until the base looks dry and pale gold for a partly baked shell, or golden brown for a fully baked one, usually another 8 to 15 minutes. Removing weights too early, before the sides have set, lets them sag.

Patching and planning for a little shrinkage

Keep a small piece of raw dough in the fridge. If a crack opens or a side slips after the weights come out, press a thin patch of raw dough into the gap and return the shell to the oven for a few minutes to bake it in.

Even well-handled crusts give up a millimeter or two. Building the crimp slightly above the rim gives you a margin, and a pie plate with a wide flat rim gives the edge a ledge to rest on. For tarts with straight sides, press the dough slightly higher than the ring and trim it after baking with a sharp knife.

Common questions

Do pie weights really make a difference?

Yes. They hold the dough against the pan while the fat melts and the starch sets. Without them, the sides slide and the base puffs. Dried beans or sugar work as well as ceramic beads if you fill the shell generously.

Is shortening less likely to shrink than butter?

Shortening melts at a higher temperature and contains no water, so shortening crusts tend to hold their shape a little better. Butter gives better flavor and flakes. Careful resting and fitting matter more than the choice of fat.

My crust shrank even though I chilled it. Why?

Most often the dough was stretched during fitting, or it was chilled before rolling but not after. Overworking during mixing or adding too much water also makes the dough elastic enough to pull back despite chilling.