The phrase "breast fillets" refers to the boneless, skinless, and often thinly sliced pieces of meat taken from the breast of an animal, typically poultry like chicken or turkey. Full definition
Fist cook the seasoned chicken breast fillets in a little olive or vegetable oil, until is white. (myzucchinirecipes.com)
You can use breast fillets instead if you prefer. (cookingninja.com)
The inspection of breast fillets may be relatively straightforward, but the varying muscle and fat composition of deboned thighs can be a real challenge for any poultry processor. (ishidaeurope.com)