Preheat oven to 350° F. Line a 9X13-inch baking dish with non-stick tin foil or regular foil sprayed with cooking spray.
To make the crust, combine the flour, brown sugar, salt and cinnamon in a medium-sized bowl. Add butter and cut in with a pastry blender or two forks until mixture is crumbly but evenly and well combined. Press the crust evenly into the prepared pan. Bake for 10 minutes.
In a medium-sized bowl, whisk eggs then add corn syrup, sugar and vanilla. Stir to combine. Stir in melted butter, followed by pecans and chocolate chips. Stir until well combined.
Pour filling over crust evenly. Bake for 25-30 minutes or until browned and set. Cool completely. Lift the bars out of the pan with the foil, cut into squares and serve.