Preheat oven to 175 C (350 F). Line 2 baking sheets with parchment paper (baking paper). There is no need to grease the paper or cookies will spread.

In a bowl, combine all-purpose flour, constarch, baking powder and baking soda. Set aside.

In another bowl, add butter, honey, white sugar, brown sugar, salt and vanilla. Whisk (by hand or mixer) until incorporated. Add the whole egg and the egg yolk and continue whisking until smooth. For cracked cookie surface, let the mixture stand for 10 minutes at this point.

Stir in flour mixture, with wooden spoon or rubber spatula, until just combined. Do not overmix. Stir in white chocolate chips and macadamia nuts.

Take about 1 tablespoon of dough at a time and roll into balls. Place them 2 inches apart on lined baking sheets. Optionally, you can chill cookies at this point to prevent them from spreading too much.

Bake 1 sheet at a time on the middle rack for about 10 to 12 minutes, until cookies are slightly brown and puffy. Halfway through baking rotate baking sheet. Cool the cookies on the sheets.