Preheat your oven to 350°F (175°C) and grease a mini muffin pan or a standard muffin pan.
In a mixing bowl, whisk together the flour, baking powder, salt, nutmeg, and cinnamon until combined.
In another bowl, whisk the melted butter, granulated sugar, milk, egg, and vanilla extract until smooth and homogenous.
Gradually add the dry ingredients into the wet ingredients, stirring gently until no flour streaks remain. Be careful not to overmix; some lumps are okay!
Using a spoon or a cookie scoop, fill each muffin cup about 2/3 full with the batter.
Bake in the preheated oven for 12-15 minutes, or until the tops are lightly golden and a toothpick inserted into the center comes out clean.
While the puffs are baking, mix together 1/2 cup granulated sugar and 1 tablespoon of cinnamon in a small bowl.
Once the puffs are out of the oven and slightly cooled (about 5 minutes), brush them with melted butter, then roll them in the cinnamon sugar mixture until evenly coated.
Allow the coated puffs to cool for a few more minutes, then dust with powdered sugar for an extra touch of sweetness.
Enjoy these delightful puffs warm, paired with your favorite morning beverage.