Preheat the oven to 350°F. Grease or line with parchment paper a 13 x 9-inch baking pan. Set aside.
In a saucepan over medium heat, melt the butter. Add brown sugar and still until completely dissolved. Stir in the maple syrup. Allow the mixture to cool to room temperature (I use refrigerated maple syrup, which cools it immediately). Once cool, add the egg, vanilla, and maple extracts, combine thoroughly.
To the saucepan, stir in the flour, baking soda, and salt. Fold in ½ cup chopped pecans. Pour batter into prepared baking dish. Sprinkle remaining ½ chopped pecans over the top. Bake for 20-25 minutes or until golden brown and set. Loosen edges with a knife and cool on a metal rack. Cut into bars or squares.
Notes
Stored at room temperature in an air-tight container these cookies should be at their best for up to 3 days.