Question: how to cook frozen chicken breast in ninja?
Answer: Select SEAR/SAUTÉ and set to HIGH. ... 
After 5 minutes, add 1 tablespoon oil and onion. ... 
Place frozen chicken breasts on reversible rack, making sure rack is in the higher position. ... 
Assemble pressure lid, making sure the PRESSURE RELEASE valve is in the SEAL position.
Select PRESSURE and set to HIGH.