To begin, preheat your oven to 350 and spray a donut pan with non-stick spray.
To a large mixing bowl, add your butter, brown sugar, and pumpkin puree and whisk them together. Add your milk, vanilla and egg and whisk together briefly till just incorporated.
To the same bowl add all of your dry ingredients: flour, baking soda, salt, cinnamon, cloves and nutmeg. Stir together till you have a thick and smooth batter. Add your apples and fold them into your batter.
Spoon your batter into your donut pan. Or, put your donut batter into a piping bag/ziploc bag (trim the end off) and pipe it into your donut pan.
Bake in the oven for 9-11 minutes, or till the top is springy to touch and a toothpick inserted comes out clean.
To a shallow bowl add your sugar and cinnamon and stir them together.
Lightly brush each donut with butter, then roll it around in the cinnamon sugar mixture and place it on a drying rack.
Devour!
Stored in an airtight container these will last 1-2 days on the counter, and about a week in the fridge. Only do the cinnamon sugar topping prior to serving.