Wrap the outside of a 9-inch spring form pan in aluminum foil.

Using an electric mixer on medium speed,
beat butter and cream cheese until light and fluffy.

Gradually add flour and sugar, and beat well.

Shape dough into a flat disc. Cover and chill 15 minutes.

Roll dough into a 13″ circle.
Carefully transfer dough to prepared pan.
Press dough into bottom and up sides of pan.
Cover and chill.

For the filling:
 

Preheat oven to 375°.

Whisk together corn syrup, brown sugar, and melted butter.
Add eggs, egg yolks, vanilla, and salt, and stir well.
Stir in pecans.
Pour filling into crust.

Bake for 15 minutes. Reduce oven temperature to 300°.
Bake 2 hours & 15 minutes or until set.
If necessary, shield pie with foil to prevent excess browning.

Cool completely on a wire rack. Cover and chill.
Remove sides of spring-form pan before serving.