It can be so frustrating when that happens! The apples themselves will shrink when cooked, so not packing the pie fully enough can lead to a falling top crust. Sometimes pre-cooking your filling a bit can help -- athe fruit will shrink down before filling and allows you to more fully fill your pie. Shrinking can also happen if you don't vent the pie, and the steam gets trapped inside. Mollie@KAF

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