01 -  Preheat oven to 400°F. Line a baking sheet with parchment paper. 
 02 -  In a large bowl, whisk together all-purpose flour, granulated sugar, baking powder, salt, and ground cinnamon. 
 03 -  Add cold, cubed butter to the dry ingredients and cut in with a pastry cutter or two knives until mixture forms coarse crumbs. 
 04 -  In a separate bowl, whisk together mashed roasted sweet potato, heavy cream, egg, and vanilla extract until smooth. 
 05 -  Gently stir wet ingredients into dry ingredients until just combined. Avoid overmixing. 
 06 -  Transfer dough onto a lightly floured surface and pat into a round approximately 1 inch thick. 
 07 -  Cut dough into 8 wedges and place on prepared baking sheet. 
 08 -  Brush tops of scones lightly with heavy cream. 
 09 -  Combine granulated sugar and ground cinnamon for the topping; sprinkle evenly over scones. 
 10 -  Bake for 22 to 25 minutes, until golden brown and fully set. 
 11 -  Transfer scones to a wire rack and let cool slightly before serving.