Preheat the oven to 425°.
Spray a large baking sheet with nonstick spray or line it with parchment paper.
Whisk together pumpkin puree, maple syrup, egg, and milk.
In a separate bowl stir together flour, sugars, cinnamon, nutmeg, baking soda, powder, and salt.
Small chop or grate hard butter into dry ingredients and mix quickly with a fork to blend.
Combine wet and dry ingredients well.
Sprinkle flour on a clean work surface, and form dough into a circle about 8" in diameter. Use a sharp knife to cut into 8 equal triangles.
Place scones on prepared baking sheet and bake for 15 minutes or until edges are lightly golden.
Remove and allow to cool. While your scones are cooling you can whip up the icing.