1. Preheat oven to 325 degrees.
2. CRUST
3. Cream butter and sugar until well-blended.
4. Add egg yolk and mix well.
5. Add flour and mix just until dough is formed.
6. Pat dough into a 9x13-inch pan, making a 1-inch border up the sides. Bake 15-18 minutes.
7. TOPPING
8. Whisk together thoroughly sugar and eggs.
9. Whisk in maple syrup.
10. Scatter pecans over crust
11. Pour syrup mixture over crust and scattered pecans
12. Bake 25-30 minutes until set.
13. Cool, cut into bars