Preheat the oven to 400°F. Grease a donut pan with cooking spray.
In a medium mixing bowl use a whisk to soft together the flour, baking powder, baking soda, cinnamon, salt, nutmeg and cloves.
In a separate large mixing bowl, whisk together the melted butter, brown sugar, maple syrup, sour cream, milk, vanilla extract and eggs.
Add the flour mixture to the maple syrup mixtrue, stirring or whisking until smooth. (You can mix the batter by hand or use an electric mixer).
Fill each donut mold about 2/3 of the wayfull. (You can use a piping bag or a Ziploc bag with the corner snipped to pipe the batter.)
Bake for 13-15 minutes or until the donuts are puffy and crisp around the edges. Cool in the pan for 5 minutes before transferring to a wire rack to cool completely.
Glaze: In a small bowl, whisk together the powdered sugar,maple syrup and heavy cream until smooth.
Dip the top of each doughnut into the glaze. Give it a little wiggle so that the glaze will adhere to the top. Allow any excess to drip off before moving it to a wire rack to drain rack. Immediately sprinkle with maple sugar or turbinado sugar and allow to set for 10 minutes, then serve.