Spray sheet pan with cooking spray and arrange chicken breasts on pan. Season well with salt and pepper.
Spoon 1.5 tablespoons of pesto over each chicken breast and spread evenly.
Place potatoes and peppers in a large bowl and toss with remaining pesto and salt.
Arrange potatoes and peppers around the chicken. Bake for 35-50 minutes or until the chicken is cooked through and potatoes are tender. -- my chicken breasts were thin-cut so they cooked in about 35 minutes.