In a large bowl, using a hand mixer or a stand mixer, cream together the butter and cream cheese until smooth.
Add the powdered sugar in the bowl a little at a time until fully mixed, scrape down the sides as needed.
Add in the egg and vanilla and continue to mix until combined.
In a small bowl, whisk together the baking powder, salt, and flour. Add to the mixer a little at a time until fully incorporated, scrape down the sides as needed.
Add in the crushed cookies and fold in until incorporated.
Cover and place the cookie dough in the fridge for at least 2 hours. The dough must be very cold before baking or the cookies will spread.
Preheat the oven to 350°F. Place 1 Tbs sized balls of the cookie dough onto a parchment lined sheet tray. You can roll the cookie dough into balls for a more uniform look.
Bake for 9-10 minutes until they are just set, remove from oven and let cool on wire rack.