Pesto Roast Chicken Prep: 5 Cook: 95 Original Source Ingredients 3-1/2- to 4-lb. roasting chicken 1 package Knorr® Pesto sauce mix 2 Tbsp. Bertolli® Olive Oil OR 3 Tbsp. I Can't Believe It's Not Butter!® Spread, melted Instructions Preheat oven to 425°. Arrange chicken, breast side up, in a 13 x 9-inch baking or roasting pan. Combine Knorr® Pesto sauce mix and olive oil. Gently spread mixture under and over chicken skin. Roast chicken for 20 minutes. Reduce heat to 350° and roast for 1 hour and 15 minutes or until meat thermometer inserted in thickest part of the thigh reaches 180°. Let stand 10 minutes before slicing.