First grease well a 24 mini muffin pan with baking spray.
In a large bowl: add sugar, melted butter and nutmeg. Blend well.
Then stir in milk and add baking powder and flour.
Mix until JUST combined. Use an ice-cream scoop to spoon batter into muffin pan.
Fill the muffin pan with batter till half full.
Bake in a 190 degree C preheated oven for 15 minutes or until a toothpick inserted in centre comes out clean.
While doughnuts are baking prepare the toppings using melted butter and ground cinnamon. Place melted butter in a shallow bowl. Also mix cinnamon and sugar well and place in another shallow bowl.
When baked, let doughnuts cool in the pan for 5 minutes.
Transfer doughnut muffins to a wire rack.
Dip the tops of doughnuts in melted butter and then in cinnamon sugar.
And you're done!