How to cook
Combine the sifted flour with the cocoa, salt, baking powder.
In a separate bowl, beat the butter with the sugar and add the eggs 1 by 1. Add the milk and flavor with the vanilla.
Make sure your butter has cooled after melting it.
Mix the dry and wet ingredients, stir with a spatula until homogeneous but don't overdo it. Stir in the chocolate chips. What I did was I melted the chocolate with a little cream and then filled the muffins with it.
Oil your muffin forms (if they're smaller, you're going to get more than 12 muffins). Fill them up to 2/3 of their height and put them to bake for about 15-20 min. or until ready in a preheated 356°F (180 °C) oven.
Let the Starbucks Muffins cool for a few min. in the forms and take them out of them.