PREHEAT oven to 350°F. Grease a 13x9-inch baking pan.
BEAT flour, butter and brown sugar in a small mixing bowl until crumbly. Press into prepared baking pan.
BAKE for 12 to 15 minutes or until lightly browned.
BEAT eggs, corn syrup, granulated sugar, butter and vanilla extract in a medium bowl with a wire whisk. Stir in chunks and nuts. Pour evenly over baked crust.
BAKE for 25 to 30 minutes or until set. Cool in pan on wire rack.