Preheat oven to 350 degreed F.
Butter a 9 -nch pie dish and about 6 1/2 cup ramekins or a larger, 10-inch pie dish.
To a large bowl add: cinnamon, ground ginger, nutmeg, salt, baking powder, and cornstarch. Add maple syrup and whisk until fully combined.
Add eggs, egg yolks, and vanilla extract. Whisk until fully combined.
Add pumpkin puree, cream, and melted butter. Whisk until fully combined. Use a rubber spatula to clean the sides and bottom of the bowl.
Add the mixture to the prepared pie dish.
Bake in the preheated oven for about 60-70 minutes. Or until the pie is settled and the center is just very slightly jiggly. The sides should be golden brown and puffed.
Remove pie from the oven and place on a cooling rack. Once it has completely cooled, transfer to the fridge for at least 6 hours or better overnight.
Serve topped with whipped cream.