Preheat oven to 180°C / 350°F.
Melt the butter
¾ cup 150g unsalted butter at room temperature
In a large bowl, combine the butter, brown sugar, and granulated sugar. Mix until the sugar is combined (around 2-3 minutes by hand).
½ cup 100g granulated (cane) sugar, ½ cup 100g brown sugar
Add the egg and vanilla and mix again until combined.
2 large eggs, 1 teaspoon vanilla extract
Add the flour, baking powder, salt, and cinnamon. Mix just until the ingredients are combined. Scrape the edges of the bowl and ensure there are no lumps to the cookie batter (aim for a smooth velvety texture - see recipe video for more info).
1 ¾ cup 230g all-purpose flour, 2 teaspoons baking powder, ½ teaspoon salt, ½ teaspoon Ground cinnamon powder
Reserve a tablespoon of chocolate and nuts to sprinkle over the top of the cookies.
3.5 oz. 100g Roasted Pistachios (no shell), loosely chopped, 3.5 oz. 100g Cashew nuts (unsalted), 5 oz. 150g white chocolate bar, loosely chopped
Stir in the chopped chocolate, pistachios, and cashews, and mix well until combined.
Line 2 baking racks with parchment paper (or cook in batches if you only have one).
Scoop around 1 heaped tablespoon of the cookie dough and place onto the lined baking sheet. Leave enough room (2-3 inches) between each cookie for them to expand.
Bake at 180°C / 350°F on the middle oven shelf for 10 minutes or until golden.
Remove cookies from the oven and allow to cool for 10 minutes before removing them from the baking rack.