Preheat oven to 350°F and line two baking sheets with parchment paper.
In a large bowl, beat together butter and sugars until light and fluffy. Beat in egg and vanilla until smooth.
8 tablespoons butter, ½ cup granulated sugar, ¼ cup lightly packed brown sugar, 1 large egg, 1 teaspoon pure vanilla extract
In another bowl, sift together flour, baking soda, and salt. Mix into the wet ingredients, stopping halfway through mixing to add in the white chocolate and macadamia nuts. Continue to mix until dry ingredients are fully incorporated.
1 1/3 cups all-purpose flour, ½ teaspoon baking soda, ½ teaspoon salt, 1 cup white chocolate chips, 1/2 cup roughly chopped macadamia nuts
Use a large cookie scoop (3 tablespoons) to scoop cookie dough onto prepared baking sheets, leaving space between cookies to allow for spreading.
Bake for 14-16 minutes, until edges are golden brown. Let cool on the baking sheet briefly, then remove to a wire rack to cool completely.
Notes
Makes about 1 dozen large cookies.
To make smaller cookies, use a medium (1 1/2 tablespoons) cookie scoop. Bake for 10-12 minutes.