In a mixing bowl combine the flour, both sugars, baking powder, salt, baking soda, cinnamon, nutmeg, and ginger. Place bowl on a stand mixer fitted with the paddle attachment.
Add the cubed butter and mix on low until the butter is pea sized.Combine the pumpkin puree and half and half then mix into the butter mixture until just combined.
On a lightly floured surface, form the dough into a rectangle then fold onto itself. Shape the dough into an 8 inch disc then cut into 8 triangles and place on a baking sheet.