These muffins remind me of a homemade donut.
Combine flour, baking powder, salt, nutmeg and cinnamon in a bowl. In a separate bowl or large liquid measuring cup, whisk the melted butter, sugar, egg, milk, and vanilla together. Add wet ingredients to dry ingredients and stir to combine.
I subbed half of the flour with whole wheat flour and they were still moist and delicious!
Recipe adapted from here.
Donut Muffins from Sam's Dish http://samsdish.com/donut-muffins/