Preheat oven to 350 F. Line baking sheets with parchment paper.
Cream the butter and sugars together.
If you have any brown sugar lumps, you should crush them up or pull them out.
Add the eggs and the vanilla and mix thoroughly.
Add the salt and baking powder and mix again.
Add 3 1/2 cups of flour and mix well. Stop here if you are going to chill the dough overnight, or just wait for another day to bake it. If you are going to roll it out right away, add another half of a cup of flour and mix again.
Gently stir in the mini chocolate chips.
Roll out dough and cut shapes as desired.