In a large bowl, using an electric mixer, cream together butter, white sugar, and brown sugar until fluffy. Beat in the egg and vanilla.
Add in the flour, baking powder & salt. Mix until just combined. (Dough will be very crumbly). Stir in ¼ cup of the chocolate chips.
Divide the dough into 6 equal portions and form each portion into a ball. Just until it comes together.
Press remaining chocolate chips all over the top and sides of the cookies. Chill in the refrigerator at least 30 minutes.
Bake in a preheated 375F oven for 18 minutes. (Bake until slightly undercooked, don't let them brown). Remove from oven, then place on a cooling rack after 5 minutes.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.