Preheat oven at 425° with cast iron skillet inside for 20 minutes.
In a mixing bowl add butter, chopped herbs, garlic, zest of one lemon, and lemon juice. Mix together and combine. Set aside.
Pat chicken dry and lift the skin to spread the herb butter in-between the skin and breast. Spread the herb butter all over the entire chicken on both sides and inside the cavity of the chicken. Tuck the wings under the chicken then season with salt and black pepper including the inside.
Stuff lemon quarters and onion quarters inside of the chicken including the sprigs of rosemary and thyme.
Carefully take the hot skillet out of the oven and place the chicken in. Put it back in the oven and bake for 1 hour.
Take chicken out of skillet and rest for 10 minutes before carving.
Video
Notes
Everyone's oven is different so be sure to check your chicken in the thickest part of the thigh with a meat thermometer for 165°.