01 - Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - Cream together butter and granulated sugar until light and fluffy. Add flour and salt; mix until a soft dough forms.
03 - Press dough evenly into the bottom of the prepared pan. Bake for 15 minutes, until set but not browned.
04 - Whisk together maple syrup, brown sugar, eggs, melted butter, flour, vanilla, and salt until smooth. Stir in toasted nuts.
05 - Pour maple nut mixture over the hot base. Return to oven and bake for 20 to 22 minutes, until topping is set and golden.
06 - Cool completely in the pan on a wire rack. Lift out using parchment, slice into bars, and serve.