Preheat oven to 350°F (175°C) and line a baking sheet with parchment paper.Cream butter, granulated sugar, and brown sugar until light and fluffy.Mix in macadamia nut butter, egg, and vanilla extract until smooth.In another bowl, whisk flour, baking soda, and salt.Gradually combine dry ingredients with wet mixture.Fold in chopped macadamia nuts.Chill dough for 30 minutes.Scoop dough onto baking sheet, spacing evenly.Bake for 10–12 minutes until edges are golden.Cool slightly before transferring to a wire rack.