Preheat oven to 350°F. Line a 13 x 9-inch baking pan with aluminum foil. Grease foil and set aside.
Crust: Mix flour, butter, brown sugar and salt in a large bowl with mixer at medium speed until mixture resembles coarse crumbs. Press firmly into a greased 13 x 9-inch baking dish. Bake 15 minutes or until lightly browned.
Filling: Stir corn syrup, sugar, eggs, vanilla and salt in a large bowl until blended. Stir in pecans and raisins or chocolate chips. Pour over crust.
Bake 25 to 35 minutes until filling is firm around edges and slightly soft in center. Cool completely before cutting into bars.