For the crust: In a large bowl, whisk together flour and salt. Cut in the cold butter with a pastry blender or your fingertips until the mixture resembles coarse crumbs with some pea-sized pieces of butter remaining. Gradually add ice water, 1 tablespoon at a time, mixing until the dough just comes together. Form into a disk, wrap in plastic wrap, and chill for at least 30 minutes.
Preheat oven to 375°F (190°C). On a lightly floured surface, roll out the chilled dough into a 12-inch circle. Carefully transfer the dough to a 9-inch pie plate. Trim and crimp the edges as desired.
For the filling: In a medium bowl, whisk together maple syrup, brown sugar, and melted butter. In a separate bowl, whisk the eggs lightly, then add them to the maple syrup mixture along with the vanilla extract. Stir until well combined.
Arrange the pecan halves in the prepared pie crust. Pour the filling evenly over the pecans.
Bake for 45-55 minutes, or until the filling is set and the crust is golden brown. If the crust edges start to brown too quickly, loosely cover them with aluminum foil.
Let the pie cool completely on a wire rack before slicing and serving.
Notes
Serve warm or at room temperature. Delicious with a scoop of vanilla ice cream or a dollop of whipped cream.