I am not familiar enough with the Peruvian cuisine to have a frame of reference to tell if the food is authentic Peruvian here, or anywhere. I can, however, attest that the chicken at Los Chicos Brasa is flavourful and moist.. The spice and taste are unique in the Markham neighbourhood. It tastes a mix of salt and chilli, balanced by a smokiness that is likely from the roasting. It doesn't taste too salty to me, though it could be to some.
I dined at the old location before. I am aware of the small portion of the quarter chicken dish. For my visit at this location, I ordered a take out of a half chicken with one side ($13.50 plus tax) for dinner. The chicken portion was slightly smaller than Swiss Chalet, but there was more than enough food for dinner. I had enough leftover to pack lunch the next day.
The take out service was friendly and fast. The take out area is spacious and clean.
LCB has my respect that they would open a non-Asian/Halah eatery in the neighbourhood. Their gut pays off, and mainly because the food sells itself.