That depends on with what the chicken breast is stuffed.
TurDuckin
You should prepare to cook your stuffed chicken for 20 minutes per pound. This is longer if the chicken is frozen.
stuffed chicken
It is a chicken stuffed with deli meat.
chicken breast stuffed with broccoli & cheese
How Long to Cook Stuffed Chicken Breast at 400 Degrees F
Definitely cooks faster when not stuffed, as there is therefore less mass to raise the temperature of.
ground chicken , stuffed contains bones meat etc
A Turducken is a boned turkey stuffed with a boned duck and boned chicken stuffed into the duck. So a chicken stuffed into a duck and those stuffed into a turkey. The layers in between each bird is usually a cornbread dressing. So to answer your question turducken recipes show how to make a turduken from start to finish.
chicken parmasien is with parmasien cheese bacon and chicken
Depending on what you have stuffed it with, 4 boneless chicken breasts will require approximately 1 hour at 150C (300F) or Gas Mark 5. Make sure the chicken meat is no longer pink.