Preheat oven to 350 degrees F. Line two baking sheets with parchment paper or silpat mats.
In a small bowl, combine flour, baking soda and salt. Whisk together and set aside.
In a large bowl, using a hand mixer or stand mixer, beat together the butter, brown sugar and granulated sugar until combined, about 2 minutes, scraping the bowl as needed.
Add in the egg and vanilla extract and continue mixing for another minute. Add the flour mixture and beat together until just combined.
Mix in the macadamia nuts and white chocolate chips until evenly distributed. With a mini ice cream scooper (or scoop 2 tablespoon portions of dough) and place the dough balls about an inch apart on the cookie sheet.
***OPTIONAL step*** place the dough balls in the refrigerator for up to 20-40 minutes. This will allow them to get firm and result in a thicker cookie.
Bake the cookies for 10-13 minutes or until the cookie edges are slightly golden brown. The center will look slightly underdone and that is perfect! Place the cookies on a wire rack to cool. Enjoy!