First, preheat the oven to 350°F and line a muffin tin with cupcake liners.

Next, add the cake flour, baking powder, and salt to a bowl. Whisk until evenly combined.

Then, in a separate bowl, cream the butter and sugar until light and fluffy.

After that, add the eggs one at a time, mixing well after each addition.

Next, add half of the dry ingredients to the butter mixture.

Then, pour in half of the milk and mix gently.

After that, repeat with the remaining dry ingredients and milk.

Lastly, add the ube flavoring and mix just until the batter is smooth and evenly colored.

Next, fill each cupcake liner about halfway with batter.

Then, bake for 19 minutes or until a toothpick inserted into the center comes out clean.

After baking, remove the cupcakes from the oven and allow them to cool completely.

Finally, frost and decorate as desired before serving.