Step 1

Using a stand or hand mixer, beat butter and sugar in a bowl until creamy, about 2 minutes. Beat in egg and vanilla until combined.

Step 2

In a separate bowl, stir together flour, salt, baking powder, baking soda, and corn starch. Gradually add flour mixture to butter mixture, beating on low speed until just combined.

Step 3

Fold in macadamia nuts until just combined (do not overbeat).

Step 4

Gently fold in 1 cup white chocolate chips. then cover and refrigerate dough for 1 hour.

Step 5

Scoop heaping tablespoon sized balls of dough then place on a parchment-lined rimmed baking sheet, spacing about 2 inches apart. Press in some more white chocolate chips and macadamia nuts and sprinkle with some flaked salt if desired.

Step 6

Bake at 350° until lightly browned, 10 to 12 minutes.

Step 7

Let cool on pan 10 minutes; transfer cookies to a wire rack, and let cool completely.