I ordered earl grey ice cream on a brioche but I think I got sugar cookies actually...regardless, after waiting in line for 45 minutes for an ice cream sandwich (and I went around 4:30pm!), I got this behemoth:
Their architectural concept is pretty cool. You can mix-and-match any of their cookies and ice cream flavors into an ice-cream sandwich, or you can get one of their "recommended" combinations, playfully named after famous architects like Mies Vanilla Rohe (Mies van der Rohe), Frank Behry (Frank Gehry), and Richard Meyer Lemon.
The locally-baked cookies are good and the ice cream is unique and tasty. I would go a little more adventurous next time and most definitely share. Since all the food trucks were kicked out from Midtown recently, I'll have to visit the Lot on Tap under the Highline to sample Coolhaus again. But then there's also Van Leeuwen there...and sometimes Kelvin Slush. Dilemmas, dilemmas...