Whisk together salt, baking soda, cornstarch, and flour in a bowl.
Combine sugar, butter, egg yolks, whole egg, and vanilla extract in a separate bowl. Whisk until smooth.
Mix the ingredients in two bowls together. Use a rubber spatula to mix until smooth with no visible flour pockets.
Fold in white chocolate chips and macadamia nuts using a wooden spoon.
Cover the dough and refrigerate it for 2 hours or more (up to 4 days).
Set the oven to 350°F. Line baking sheets with parchment paper.
Scoop the prepared dough into balls ( 1-1 ½ tbsp each) and arrange on prepared sheets, 3 inches apart.
Bake the cookie dough balls for 12-15 minutes until their edges are golden and centers are slightly underdone.
Let the cookies cool on the sheet. After 5 minutes, transfer them to a wire rack to cool completely.