The phrase "to overcook the chicken" means to cook the chicken for too long, resulting in it becoming dry, tough, and less enjoyable to eat. Full definition
Absolutely do not overcook the chicken escalope. (remonline.com)
I'm sure it would work with chicken breasts however the cooking time may need to be adjusted to avoid overcooking the chicken. (spendwithpennies.com)
I personally think it's insanely easy to overcook chicken breast and have really dry chicken, but maybe you don't care about dry chicken (my husband likes it dry). (cleaneatingrecipes.com)