If the corn kernels are in milk
Brocho before eating this, if the corn kernels are the majority: Borei Pri Ha'adama
Brocho before eating this, if the milk is the majority: Shehakol Niyeh Bedvoro
Brocho after eating the proper shiur of this: Borei Nefashos
If the corn kernels are in water
Brocho before eating this: Borei Pri Ha'adama
Brocho after eating the proper shiur of this: Borei Nefashos
Source: The Laws of B'rachos (page 380)