Beat butter and sugars.
Add eggs, yolk and vanilla.
Mix all of dry ingredients in a bowl and add to the batter just to combine.
Add crushed cookies and sprinkles.
Chill dough for an hour or more.
Scoop 6 ounces for huge cookies and 3 ounces for smaller. Stuff 2-3 circus cookies into the center and encase with dough. Lay on parchment lined cookie sheet.
These bake at 425 so I baked the tray on top of a SECOND tray (face down) so they wouldn't burn on the bottom.
The smaller ones baked about 12 mins for me.
The larger will need a few extra minutes.
Once cool drizzle with melted chocolate and more sprinkles!