In a large bowl mix together: flour, baking powder, baking soda, and salt.
Chop in the cold/soft butter until the size of peas. Then toss in chopped pecans.
In a small bowl mix together: sour cream, sourdough starter, vanilla extract, milk, and maple syrup.
Mix the wet ingredients into the dry ingredients until it is partly combined. Dump contents out on a clean surface and gently press into a 2 inch thick circle. Now, you can either cook right away or cover with cling wrap, place in the refrigerator and cook in the morning.
Divide the disc of dough into 8 slices. Arrange on a baking sheet.
Bake at 350° F for 20 minutes.
While the scones are cooking, heat a pot on high heat. Combine the butter and maple syrup together in the pot. Boil maple syrup and butter together until candy thermometer reads 240° F.
Place scones on a wire rack to cool. Drizzle hot, candied maple syrup mixture over the warm scones.