Preheat the oven to 170°C. Line an oven tray with baking paper.
In a large bowl, beat the softened butter and sugar together until light and fluffy. Add the eggs, one at a time, mixing well after each addition.
Sift in the flour, matcha powder and baking powder. Stir to form a dough.
Fold through the chopped macadamias and white chocolate until evenly combined.
Cover the dough and rest in the fridge for 1 hour.
Divide the dough into even portions and place on the prepared tray, allowing room for the biscuits to spread.
Bake for 13–15 minutes or until just golden around the edges.
Transfer to a wire rack to cool completely before enjoying.