Preheat oven to 350 degrees. Line cupcake pan with cupcake liners.
In a bowl with an electric mixer fitted with a paddle attachment, combine flour, sugar, baking powder and cinnamon on a low speed.
Add butter and milk. Mix on a low speed until just combined. Increase to medium speed and mix for 1-2 minutes.
Scrape down the sides of the bowl and add eggs and vanilla extract. Beat on medium speed until it is just combined.
Using a medium ice cream scoop, scoop batter into cupcake liners.
Bake for 16-18 minutes, or until wooden toothpick comes out clean.
Using a fork or a offset spatula, take cupcakes out of the pan.
While they are still warm, dunk the cupcake into the cinnamon sugar topping. Set aside to cool.