In a small bowl, combine the flour and brown sugar; cut in butter until crumbly. Press into a greased 13-in. × 9-in. × 2-in. baking pan. Bake at 350 F. for 10-15 minutes or until golden brown.
Meanwhile, in a large bowl, whisk the eggs, sugar, corn syrup, butter and vanilla until blended. Stir in chocolate chunks and pecans. Pour over crust. Bake for 20-25 minutes or until set. Cool completely on a wire rack. Cut into bars. Store in an airtight container in the refrigerator.
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