Preheat the oven to 350°F (175°C).
Line a muffin tin with cupcake liners.
In a mixing bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Mix in the vanilla extract and milk until well combined.
In a separate bowl, whisk together the flour, baking powder, cinnamon, and salt.
Gradually add the dry mixture into the wet ingredients, mixing until just combined.
Spoon the batter into the lined muffin tins, filling each about two-thirds full.
Bake for 18–20 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cupcakes to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
Once cooled, frost the cupcakes with your choice of frosting and decorate as desired.