Beat flour, butter and brown sugar in small mixer bowl until crumbly. Press into prepared 13x9 baking pan. Bake for 12 to 15 minutes or until lightly browned.
Beat eggs, corn syrup, granulated sugar, butter and vanilla extract in medium bowl with wire whisk. Stir in chunks and nuts. Pour evenly over baked crust.
Bake for 25 to 30 minutes at 350, or until set. Cool in pan on wire rack. Cut into bars.