Preheat the oven to 350 degrees.

Combine flour, baking powder, baking soda, salt, and nutmeg in a bowl. Set aside.

Combine sugar, eggs, milk, vanilla extract, and melted butter in a separate bowl. Mix thoroughly.

Add dry ingredients to wet ingredients and stir until just mixed. Do not over-mix the batter.

Lightly spray donut pans with nonstick cooking spray.

Fill a gallon-sized plastic bag with donut batter. Cut a hole in one corner and gently squeeze the batter into each donut cavity.

Bake donuts for 11-13 minutes or until a toothpick inserted comes out clean.

Let donuts cool in the pan for 5-7 minutes then transfer the donuts to a cooling rack.

Pour powdered sugar into another gallon-sized plastic bag. Add a warm donut then shake to cover the donut completely with powdered sugar. Place the sugar-covered donut back onto the cooling rack. Repeat with remaining donuts.

Allow donuts to cool completely.