Grease an 8-inch square baking pan.
In food processor, place chocolate chips and sugar.
Process until chocolate is as fine as sugar.
Add butter, eggs and vanilla and mix for 1 minute.
Blend in flour, baking powder, salt and white chocolate.
Place batter in prepared pan.
Convection Bake at 350°F for 40 to 45 minutes or until toothpick inserted in center comes out clean.