Brocho before eating this:
On the crust: Borei Minei Mezonos
On the cream: Shehakol Niyeh Bedvoro
Brocho after eating the proper shiur of this: Borei Nefashos (in most cases a K'zayis of crust is not eaten in the correct time span. If you do, say Al Hamichya)
Source: The Laws of B'rachos