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Line 9-inch (2.5 L) square metal cake pan with parchment paper; set aside.
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Base: In large bowl, mix flour with brown sugar.
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With pastry blender, cut in butter until mixture is moist and crumbly.
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Press firmly over prepared pan.
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Bake in centre of 350°F (180°C) oven for 10 minutes.
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Sprinkle with pecans and press lightly; bake for 5 minutes.
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Meanwhile, in bowl, beat butter, sugar and corn syrup until smooth; beat in eggs and vanilla.
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Stir in flour and salt; pour over base.
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Bake until darkened and slightly jiggly when shaken, about 20 minutes.
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Let cool on rack. (Make-ahead: Wrap and store in airtight container for up to 1 week or freeze for up to 3 weeks.)
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Cut into bars.