⅓ cup plus 2 tablespoons granulated sugar, divided
1½ teaspoons baking powder
1 teaspoon baking soda
½ teaspoon salt
6 tablespoons unsalted butter, cubed
½ cup white chocolate chips
½ cup chopped macadamia nuts
⅔ cup buttermilk
1 large egg, lightly beaten
1 teaspoon vanilla extract
Instructions
Preheat oven to 350°. Line 2 rimmed baking sheets with parchment paper.
In a large bowl, whisk together flour, ⅓ cup sugar, baking powder, baking soda, and salt. Using a pastry blender or 2 forks, cut butter into flour mixture until it resembles coarse crumbs. Stir in white chocolate chips and macadamia nuts.
In a medium bowl, whisk together buttermilk, egg, and vanilla extract. Add to flour mixture, stirring until dough is just combined.
Drop dough by heaping teaspoonfuls 2 inches apart onto prepared baking sheets. Sprinkle dough evenly with remaining 2 tablespoons sugar.
Bake until lightly browned, 14 to 16 minutes. Serve warm or at room temperature.