Preheat oven to 375F Lightly grease and line a 9x9 baking pan with parchment paper sling for easy removal after baking. Note: you can do without the parchment if you want to serve your blondies right from the pan.
Blend the butter and sugar together well in a mixing bowl. Beat in the egg and maple syrup, then blend in the extracts.
Sift in the flour, soda, and salt and then gently stir to combine. When almost fully blended, add 1 1/4 cups of the walnuts (save the last 1/4 cup for sprinkling on the top) and continue to fold until everything is incorporated, but don't over mix.
Spread the batter into the prepared pan and smooth out. Sprinkle the reserved walnuts over the top and press down just lightly.
Bake for 30-35 minutes or until the edges look done and the center is not jiggling. Let cool for 15-20 minutes before gently lifting out the blondies with the parchment sling to cool completely on a rack.