In a medium bowl, whisk together the flour, cornstarch, baking soda, and salt and set aside.
In a stand mixer, cream together the butter and both sugars on a low speed until combined. Scrape the bowl down once or twice as needed. Add the egg and vanilla and beat until combined. Scrape the bowl down as needed.
Add the dry ingredients to the wet and mix on low until just combined. Add the funfetti white chocolate chips and 3 ounces of chopped macawrongs. Mix on low until combined. It should just take a few seconds.
Use a large cookie scoop to portion the dough. Scoop the dough ball into your hand and lightly flatten into a disc. Place half of a macawrong into the dough and wrap the rest of the dough around it. Roll into a ball and place onto a tray or baking sheet lined with wax paper. Repeat with the remaining cookie dough.
Then top each scoop with extra funfetti chips and broken macarons.
Place the trays in the freezer for at least one hour. Transfer the frozen cookie dough balls to a freezer bag or airtight container. Freeze for at least 4 hours, but preferably overnight.
When you are ready to bake, preheat the oven to 325°F. Place frozen cookie dough balls on a baking sheet lined with a silicone baking mat or parchment paper. Bake for 21- 23 minutes or until lightly golden brown.
Let them cool on the baking sheet for 5- 10 minutes before transferring them to a cooling rack.