Mix your sour cream with the baking soda in a bowl to poof it up.
Put all your dry ingredients into a large bowl and whisk them all together to get the spices and baking powder all the way through it.
Cut in your butter with either two knives criss-cross or a pastry blender.
Combine your pumpkin and egg together.
Add your pumpkin/egg mix, and the sour cream into the dry ingredients. Mix together thoroughly.
Once mixed, divide into three equal sized balls.
Flatten into 6 inch circles, and then cut each circle into 6 pie shaped pieces.
Place on a well greased baking sheet, and bake in a 350 degree oven for 20-25 minutes, or until browned on the bottom and top.
For the spicy glaze, take all your ingredients and mix them together in a bowl. Once the scones are cool, drizzle on top, or use a ziploc bag with the corner cut out and use that to decorate them.