Whisk together the flour, baking powder and salt in a medium sized bowl. Set aside.
In a bowl attached to a stand mixer equipped with the paddle attachment, beat the butter and sugars together until creamy. Add in the eggs, one at a time, beating until each is incorporated completely. Add in the vanilla, beat again.
Beat in the flour mixture until just combined, then add in the chocolate chips. Stir to distribute the chips evenly throughout the dough.
For the original sized cookies, drop by rounded tablespoonful onto ungreased cookie sheets, approximately 2 inches apart. For larger cookies like mine, use an ice cream scoop and place 6 to a cookie sheet with lots of space between.
Original Cookies : bake in the oven from 18-22 minutes.Large cookies: Bake in the oven from 20-25 minutes or more, until the edges are browned and set and the middle is cooked.
Cool on the sheets for 3-5 minutes then transfer to a cooling rack to cool completely.
Notes
Store these in an airtight container at room temperature for 3-4 days, or freeze them in a sealed container for up to one month.