Position rack in lower third of oven. Preheat oven to 425 degrees and set cookie sheet on rack to get hot.
Line 9-inch pie plate with crust. Line crust with foil and fill with pie weights. Place on cookie sheet in oven. Prebake crust 15-20 minutes.
Remove cookie sheet with pie plate on it, gather up edges of foil with pie weights inside and lift out. Set aside pie shell.
Reduce oven temperature to 375 degrees at 5,000 feet, 325 degrees at 10,000 feet. Move oven rack to center of oven.
Melt butter in medium saucepan, then stir in brown sugar, corn syrup, molasses and salt. In cup, combine lemon juice and 1 teaspoon vanilla; stir in cornstarch until dissolved, then stir mixture into pan.
Bring to full, bubbling boil over medium-high heat, stirring constantly with wooden spoon, about 3 minutes. Stir down bubbles, then remove from heat. Stir in remaining vanilla. Whisk eggs in mixing bowl. While continuing to whisk, add a few tablespoons hot syrup to eggs, then whisk eggs into hot syrup, beating well as you do so (strain mixture if lumpy).
Pour hot filling into partially baked pastry shell and arrange nuts on top. Bake about 30 minutes, or until knife inserted in center comes out clean or coated with clear syrup.
Cool pie on wire rack and serve at room temperature.
Pre-heat oven to 350 degrees. Line two large cookie sheets with parchment paper or waxed paper.
Either by hand or with electric mixer, beat butter until creamy.
Add sugars; beat until fluffy, about 3 minutes.
Beat in eggs one at a time.
Mix flour, salt, baking powder, and nutmeg together in medium bowl.
Stir dry ingredients into butter-sugar mixture.
Stir in oats, raisins and optional walnuts.
Working with generous 2 tablespoons of dough each time, roll dough into 2-inch balls. Place balls on parchment-lined cookie sheet, leaving at least 2 inches between each ball.
Bake until cookie edges turn golden brown, 22 to 25 minutes.
Let cool on cooling rack at least 30 minutes before peeling cookie from parchment.
If you prefer a less sweet cookie, you can reduce the white sugar by one-quarter cup, but you will lose some crispness. Do not over bake these cookies. The edges should be brown, but the rest of the cookie should be very light in color. The trick to making the cookies chewy is to make them large. Smaller cookies tend to get more dried out and crisp, and therefore not as chewy.