Preheat your oven to 350°F and get your muffin tins ready with cupcake liners.
Using a mixer, cream the butter and sugar until light and fluffy, about 2 minutes.
Crack in the egg and blend it into the creamed mixture.
Sift the cake flour, salt, and baking powder together and set this dry mix aside.
In another bowl, whisk together the milk, vanilla extract, and oil.
Gradually mix the dry ingredients with the milk mixture into the creamed butter, alternating between the two.
After each addition, beat the batter well to ensure it's thoroughly mixed.
Gently fold the mini chocolate chips into the batter.
Scoop the batter into the cupcake liners, filling each about two-thirds full.
Bake in the preheated oven for 16-17 minutes, or until a gentle press on the cupcake top springs back.
Once baked, let the cupcakes cool before topping with your favorite chocolate buttercream frosting.