Cream butter, Crisco and sugars on MEDIUM speed
Blend in 1 whole egg, 1 egg YOLK and vanilla on MEDIUM speed
Whisk the dry ingredients together.
Gradually mix in the dry ingredients until well incorporated at MEDIUM speed.
Toss chips and nuts with 1 T of flour; Blend in on LOW speed.
Chill for at least 1 hour and 30 minutes.
Using a medium cookie scoop, drop dough 2 inches apart onto a parchment paper-lined rimmed baking pan.
Bake at 350°F for 14-16 minutes. They should be slightly golden around the edges.
If you desire a larger cookie, use a large scoop and increase baking times to 18 minutes.
Allow cookies to cool on baking pan for about 2 minutes. Remove to cooling rack.