Wash chicken and remove bag of gizzards and set aside. Pat dry chicken with paper towels.
Preheat oven to 400° F
Place chicken in baking dish
Cut slits in chicken skin all over. Slice skin enough to be able to place pats of butter underneath.
Cut up butter into slices, and place under chicken skin.
Sprinkle 2 TBSP of olive oil all over the outside of the chicken.
Season chicken, inside and outside with Salt, pepper, garlic powder and italian seasoning.
Rub chicken with hands to mix all the spices in.
Cut 1 onion in slices and spread evenly in bottom of baking dish and inside of chicken cavity.
Add water to bottom of baking dish.
Add baking dish to oven once ready, and baste chicken every 30 minutes with juices from bottom of baking pan.
After 1 hour and 40minutes, increase temperature to 425°F for 30 minutes (or until internal temperature reaches 165°F)
Remove chicken from oven, and place baking dish ontop of stove for 10 minutes to rest before slicing.