Remove and discard paper circle from pie. Place frozen pie on a heavy baking sheet.
Bake at 400° for 30 minutes. Remove from oven.
Stir together crushed gingersnaps and next 5 ingredients until crumbly; sprinkle evenly over pie.
Bake at 400° for 1 hour, shielding top of pie with aluminum foil after 30 minutes.
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