Beat butter until light and fluffy. Add brown sugar and vanilla and mix for one minute.
Add flour and mix until combined. Scoop out 1 Tbsp of dough and set aside. Add 3/4 cup of the chocolate chips and mix until combined.
Line a cookie sheet with parchment paper. Scoop 1.5 Tbsp of dough and roll into a ball; place onto cookie sheet. Repeat until you have rolled all the dough.
Place remaining chocolate chips in a microwave-safe bowl and microwave on high for 15-second intervals stirring each time, until melted.
Drop cookie dough balls one at a time into melted chocolate, coating each one completely, and place them back on the cookie sheet. Continue until you have coated every cookie dough ball.
Crumble up the cookie dough you set aside earlier and sprinkle the top of the truffles with it.
Place the tray of truffles in the fridge and chill until hardened, then transfer them into an airtight container and store in the fridge for up to one week.