In separate large bowl, combine brown sugar, sugar and butter; beat until light and fluffy. Add eggs 1 at a time, beating well after each addition. Add vanilla; blend well. Gradually add flour mixture; blend at low speed just until combined. Fold in cranberries, walnuts and 1 1/2 cups of the vanilla chips. (Reserve remaining chips for topping). Spread batter in greased foil-lined pan.