Cream butter and sugar together just until fluffy, about 2 minutes.
Add In Eggs, One At A Time, Beating Just Until Combined. Add In Vanilla And Beat Again.
Combine, Flour, Cocoa, Baking Powder And Salt.
Alternating, Add Flour And Milk, Starting And Ending With Flour, Beating Just Until Combined.
Spoon Batter Into Cupcake Tins Lined With Paper Liners Or Lightly Greased, To 2/3 Full.
Bake In A Preheated 350 Degree Oven For 16-18 Minutes, Until Done.
Let Cupcakes Rest In Pan For 20 Minutes Before Removing To Racks To Cool Completely.
