Preheat oven to 350 F.
Beat butter until softened.
Add sugar and beat until light and fluffy, about 3 minutes.
Add eggs, one at a time, beating until well combined.
Measure the flour, baking powder, baking soda, salt, and cocoa powder into a small sized bowl and whisk to combine.
Measure out the milk and vanilla and stir to combine.
Add about a third of the dry ingredients to the butter/sugar and beat to combine. Add about a half of the milk/vanilla and beat to combine.
Continue adding, alternating between dry and wet and finishing with the dry.
Stir in chocolate chips.
Scoop batter into cupcake cups about 1/2 full.
Bake for 22-25 minutes or until a cake tester comes out clean.