Preheat the oven to 350 F. Spray muffin tin with non-stick spray and set aside.

In a medium dish, combine flour, baking powder, salt and ground nutmeg.

Beat butter and sugar in a larger dish, until the mixture is light and fluffy, then add an egg and vanilla, beat until incorporated. 

Continue beating, adding the flour mixture and milk alternately until you use up all the ingredients and until it´s well combined.

After that, divide batter among 10 muffin cups and bake for 20-25 minutes or until the toothpick put in the middle comes out clean or with a few crumbs on it.

Meanwhile, make the topping by melting 6 teaspoons of butter, while combining sugar and cinnamon in a small dish.

Take the muffins out of the oven and leave them to cool for a few minutes, then dip each muffin into melted butter and then roll them in the sugar and cinnamon mixture, until they´re fully coated.