First, add the flax seed meal into a small bowl along with the water. Mix well and let it sit for atleast 5 mins.

  

Add the all purpose flour, baking soda and salt into a mixing bowl and mix well.

  

Add the softened butter, white and brown sugar into a separate mixing bowl. Using a hand whisk, beat it until light and fluffy.

  

Add the vanilla extract, flax water mixture to the butter sugar mixture. Beat until combined well.

  

Slowly add the dry mixture (flour, salt) to the wet mixture (butter, sugar, flax) and mix well until combined.

  

Add the white choco chips and the macadamia nuts and mix gently until combined.

  

Preheat oven to 350 F. Grease a baking sheet and keep aside. Scoop about 2 Tbsp of the dough, form into a loose ball. Split it into 2 halves. Place once half on the baking sheet with the flat surface down. Place the other half on the first half such that the flat surface is upwards. Alternatively, you can just scoop up 1.5 Tbsp of the dough, form into a loose ball and place it on the baking sheet.

  

  

Bake for about 10 - 12 mins or until the edges of the cookie are slightly golden brown. Pull out the cookies from the oven and leave them to cool down for atleast 10 mins. You can store it in an air tight container and it would be good for atleast a few days.