Pumpkin. Use 100 percent pumpkin puree, not pumpkin pie filling. Drain homemade puree if it looks watery. Pan. Lightly grease the nonstick skillet with butter or oil before each batch. Storage. Refrigerate cooled pancakes in an airtight container for up to 3 days. Freezing. Freeze cooled pancakes with parchment between them for up to 2 months, and reheat them until hot.