If it is stuffed with bread
Brocho before eating the stuffing: Borei Minei Mezonos
Brocho before eating the chicken: Shehakol Niyeh Bedvoro
Brocho after eating the proper shiur of this: Al Hamichya [assuming a proper shiur of Mezonos was eaten] and Borei Nefashos
If it is stuffed with rice
Brocho before eating the stuffing: Borei Minei Mezonos
Brocho before eating the chicken: Shehakol Niyeh Bedvoro
Brocho after eating the proper shiur of this: Borei Nefashos
Source: The Laws of B'rachos (page 382)