Maple and walnut are heavenly together, especially with whipped cream!
Preheat the oven to 375 degrees F.
In a mixing bowl, beat together the eggs, brown sugar, flour, maple syrup, and butter. Stir in the nuts. Pour into the pie shell.
Bake for 40 to 45 minutes or until a tester inserted near the center of the pie comes out clean. Serve warm or completely cooled.