Preheat the oven to 350°F (175°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, baking powder, baking soda, spices (cinnamon, nutmeg), and salt.
In another bowl, combine the pumpkin puree, granulated sugar, brown sugar, egg, milk, and melted butter. Mix until well combined.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Be careful not to overmix.
Using a spoon or your hands, form small balls of dough (about 1 inch in diameter) and place them on the prepared baking sheet.
Bake in the preheated oven for 12-15 minutes or until lightly golden and a toothpick inserted into the center comes out clean.
While the donut holes are baking, prepare the cinnamon sugar coating by mixing the ½ cup sugar with 2 teaspoons of cinnamon in a small bowl.
Once the donut holes are done baking, remove them from the oven and let them cool for a few minutes. While still warm, roll each donut hole in the cinnamon sugar mixture until fully coated.
Serve warm or at room temperature and enjoy!