Preheat the oven to 350 F. Then lightly grease a muffin pan with oil. You can put a little oil on a paper towel and cover the sides of the pan. It will help the muffins prevent from sticking. You can use muffin papers, however, baking the batter without them will make the sides of the muffins browner and crispier.
In a large bowl whisk together the sugar and the egg, until it's foamy and light in color.
Then combine in a smaller bowl the flour, baking powder, salt, nutmeg.
Pour this to the egg mixture and stir to combine.
Then add milk, oil, and vanilla to the batter and whisk until it is smooth.
Divide the batter into the muffin cups evenly. Preferably filling each ¾ full.
Bake the muffins for 18 minutes or until golden brown on the top and an inserted tester comes out clean.