Fun, unique desserts if a bit pricey. One night after visiting Secret Pizza we tried the B'Day Milkquake ($10) - this was the better of the items we sampled. It's their Cereal Milk soft serve with birthday cake mixers stirred in. Easily feeds two. This alone will bring me back. On a later visit, we also tried single servings of their birthday cake soft serve ($6) and while good, seemed pricey for what you got and just didn't compare to the B'Day Milkquake.
Seating can be a challenge late night (they don't have their own dedicated space) and if you need a sugar fix after visiting Secret Pizza, make sure you pay attention to closing times as Milk Bar closes first.