Hi NM, it's somewhat normal for the popover to deflate slightly when pierced, as it's the steam that helps puff them up and create the structure. However, the steam can also make the insides a bit damp and soggy, so we typically recommend piercing when they come out of the oven. If you're going to serve the popovers right away, you can try skipping this step. It becomes more important if the popovers are going to be served at a later time. We hope this helps! Kye@KAF

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