Preparing the Dough
In a large bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
In another bowl, use an electric mixer to cream the butter, brown sugar, and granulated sugar until light and fluffy (about 3-4 minutes).
Add the egg and vanilla extract, mixing well.
Gradually fold in the dry ingredients until just combined.
Stir in the white chocolate chips (and any optional add-ins).
Cover the dough and chill in the fridge for 30-60 minutes to prevent spreading.
Baking the Cookies
Preheat the oven to 180°C (350°F). Line a baking tray with parchment paper.
Scoop 1.5 tablespoon portions of dough onto the tray, spacing them 3 inches apart.
Bake for 10-11 minutes, or until the edges are golden brown.
Sprinkle extra white chocolate chips on top during the last 2-3 minutes of baking for a decorative touch.
Remove from the oven and let cookies cool on the tray for 5 minutes before transferring to a wire rack.
