Sounds like there's some trapped air there that's expanding once the pie hits the heat of the oven creating that pocket! This may be a good opportunity to call our baker's hotline at 855-371-2253 - we'll ask questions like oven temp, if this happens with other fillings, pie crust recipe, and what the pumpkin filling includes. We look forward to your call - we're here from 9 AM to 9 PM on weekends and from 8 AM to 9 PM weekdays (eastern time of course)! Irene@KAF

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