Preheat the oven to 400°F.
Pat the entire chicken dry with a paper towel. Place dried chicken skin side down on a baking sheet or in a large cast-iron pan and season generously with salt and pepper on all sides.
In a small bowl, mix together the butter, herbs, garlic, and a generous pinch of salt.
Starting with the opening nearest the chicken breast, stuff the mixture in between the chicken skin and flesh. Spread it into as many spaces as possible, being careful not to tear the skin.
Use a toothpick or skewer to poke holes in the skin all over. This will help the skin become crispy.
Roast for 40 to 45 minutes until the internal temperaturereaches 165°F.
Allow the chicken to rest for at least 15 minutes before carving. Garnish with sage leaves.