Brocho before eating this: Borei Minei Mezonos
Brocho after eating the proper shiur of this:
If the proper shiur of crust is eaten, say Al Hamichya
Otherwise, say Borei Nefashos
If one is Koveah Seduah on this item, Hamotzi Lechem Min Ha'aretz and Bentching are required.
Source: The Halachos of Brochos Handbook (1994) (page 15)