Preheat the Oven: Set your oven temperature to 350°F (175°C). Grease a mini muffin pan or a donut hole pan generously to prevent sticking.
Mix Dry Ingredients: In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, baking soda, salt, ground cinnamon, and ground nutmeg until evenly combined, ensuring no lumps remain.
Combine Wet Ingredients: In a separate medium-sized bowl, whisk together the buttermilk, egg, melted unsalted butter, and vanilla extract until smooth and homogenous.
Combine Mixtures: Gently pour the wet ingredients into the dry ingredients. Stir with a spatula or wooden spoon until just combined; be careful not to overmix. The batter should be thick yet fluffy.
Fill the Pan: Spoon the batter into each cavity of the donut hole pan, filling each about two-thirds full to allow for rising during baking.
Bake: Place the pan in the preheated oven and bake for 10-12 minutes. The donut holes are ready when the tops are golden brown and a toothpick inserted in the center comes out clean.
Prepare the Maple Glaze: While the donut holes are baking, prepare the glaze. In a small bowl, combine the powdered sugar and pure maple syrup, then gradually add milk. Stir until the mixture achieves a smooth, pourable consistency. Adjust with more milk or powdered sugar as necessary to reach your desired thickness.
Cool and Glaze: Once the donut holes are done baking, remove them from the oven and allow them to cool for about 5 minutes. Carefully take them out of the pan and set them on a wire rack.
Dip in Glaze: Dip the warm donut holes into the prepared maple glaze, allowing any excess glaze to drip off before placing them back on the wire rack.
Set and Serve: Let the glazed donut holes sit for a few minutes to allow the glaze to set before serving.
Notes
Arrange the glazed donut holes on a decorative platter and garnish with mint.