Preheat the oven: Preheat the oven to 356ºF (180ºC). Line a 6-hole muffin/cupcake baking pan with regular-sized paper cups.
Mix dry ingredients: In a medium size mixing bowl, add flour, baking powder, salt, cinnamon, and orange zest. Whisk until well combined. Set aside.
Prepare the butter: In a large mixing bowl, using either electric hand beaters or a stand mixer with the paddle attached, add softened butter to the bowl.
Cream the butter: Beat butter for a few seconds to break it up and it begins to turn creamy. This makes it easier on your beater when the sugar is added.
Add sugar: Add sugar and beat with the butter for 1 minute until pale and creamy. Scrape down the sides as needed.
Add egg: Add egg and beat for 20 seconds. Scrape down the sides as needed.
Incorporate wet ingredients: Pour in milk, oil, and vanilla. Beat for 20 seconds until well combined. Scrape down the sides again.
Combine with dry ingredients: Add the dry flour mixture and beat until incorporated, about 30 seconds. Ensure not to over-beat, just until the flour has combined then turn off the beater. If some excess flour is still visible around the sides of the bowl, gently fold it in with a spatula. If you over-beat, the cakes won't be as soft and fluffy.
Fill the cups: Spoon and evenly distribute the batter into the paper cups, filling each 3/4 of the way full. The batter will make 6 even cupcakes. Note: I use a small ice cream scoop and place 2 scoops full into each cup.
Bake: Bake for 18-20 minutes or until a toothpick inserted into the middle comes out clean and they’re lightly golden.
Cool: Remove from oven and allow cupcakes to cool in pan for 5 minutes. Carefully transfer to a wire rack to cool completely.
Carefully transfer to a wire rack to cool completely.