Preheat oven to 350 degrees.

In a small mixing bowl, combine flour, baking powder and salt and set aside.

In a large mixing bowl beat butter, sugars, and vanilla until creamy. Add eggs, one at a time, beating well after each addition. Gradually beat in flour mixture. Stir in chocolate and nuts.

Spread evenly into well-greased 10″ x 10″ x 1″ pan (an 8 ” x 13″ x 2″ will work fine).

Bake for 35-40 minutes, or until toothpick inserted comes out with just a few crumbs.

Cool on a rack until room temperature.

Slide knife around sides of the pan and invert onto a cutting board. Cut into desired sized pieces.

Chill the Blondies before cutting for cleaner edges.