Preheat oven to 375º. Combine flour, baking powder and baking soda in medium bowl. Set aside.
Combine butter, sugar and brown sugar in large bowl. Beat at medium speed, scraping bowl often, until creamy. Add eggs and vanilla. Continue beating until well mixed. Reduce speed to low. Gradually add flour mixture until well mixed. Stir in chocolate chips.
Drop dough by 1/4 cupfuls, 2 inches apart, onto ungreased cookie sheets. Bake for 10-14 minutes or until light golden brown. Let stand 1-2 minutes.