Grease 12 muffin tins with butter and set aside.
Pre-heat the oven to 350.
In a medium bowl add in the flour, salt, baking powder and cinnamon. Whisk and set aside.
In a medium bowl add in the oil and the sugar. Whisk together.
Beat in the egg well, then stir in the vanilla.
Alternate adding the dry ingredients and the milk to the wet ingredients, making sure to sift the dry ingredients over as you go.
Add the batter to the pans filling only half way, about 2 Tbsp. batter each muffin tin.
Bake for 18-20 minutes or until a tooth pick comes out clean from the center. As soon as you can handle them place them on the wire rack.
Add the cinnamon and sugar to a small bowl and mix.
Add the melted butter to a separate bowl.
Right away dip one muffin top at a time into the butter then roll the top into the cinnamon sugar and place back onto the wire rack. Repeat until each muffin is done.
Enjoy them warm or at room temperature.