In a large bowl (or the bowl of a stand mixer) whisk flour, sugar, baking powder, salt, and all spices together.
Add in the cold butter. Using a fork or pastry cutter work the butter into the dry ingredients until the mixture resembles coarse crumbs. You can also do this with a standing mixer and the paddle attachment.
Next, add in the egg, pumpkin puree, vanilla extract, and buttermilk. Start with 1/3 cup buttermilk. If the dough is too try, add in the remaining buttermilk, one Tbsp at a time.
Once the scone dough has come together, turn out onto a lightly floured surface and pat it into a disc/circle, about 1/2” thick.
Press the crumb cake topping on top of the pumpkin dough, gently pressing it into the dough so it stick.
Cut in 8 triangles and place onto your prepared baking sheet.
Bake at 400 for 18-20 minutes. Allow to cool a few minutes before adding the icing.