In a container, mix together: melted butter, 4 crushed garlic cloves, salt, black pepper, paprika, chili flakes and the juice of half a lemon.
After thoroughly washing and drying the chicken with paper towels, rub the entire surface with the prepared mixture. Add the remaining garlic, lemon, and rosemary inside the chicken.
Place the chicken in the preheated oven at 180 °C for 1 hour and 30 minutes.
Serve the chicken with a side dish of mashed chicken, baked potatoes or salad.