Preheat oven to 350 degrees.
In bowl, mix together dry ingredients - flour, baking powder, salt, and sugars
In a separate bowl mix together wet ingredients - milk, melted butter, egg, and vanilla
Add wet ingredients to the dry ingredients and mix until combined. Do not overmix.
Fold in mini chocolate chips.
Scoop into lightly greased mini muffin pan filling each cup ¾ full.
Bake in preheated oven for 10 - 12 minutes. Tops will spring back when lightly pressed.
Cool briefly in muffin pan before transferring muffins to wire rack to cool completely.