Heat oven to 375°F. Combine flour, baking powder, baking soda and salt in medium bowl. Set aside.

Combine butter, sugar, and brown sugar in large bowl. Bet at medium speed, scraping bowl often, until creamy. Add eggs and vanilla. Continue beating, scraping bowl often, until well mixed. Reduce sped to low. Beat, gradually adding flour mixture, until well mixed. Stir in chocolate chunks.

Drop dough by 1/4 cupful, 2 inches apart, onto ungreased cookie sheets. Bake for 10 to 14 minutes or until light golden brown. (DO NOT OVERBAKE.) Let stand 1-2 minutes on cookie sheet, remove to cooling rack.

TIP: For 2 1/2- inch cookies, drop dough by rounded tablespoonfuls, 2 inches apart, onto ungreased cookie sheets. Bake for 10 to 12 minutes or until light golden brown. 4 dozen cookies.