Preheat your oven to 425°F (220°C).
Pat the chicken dry with paper towels and place it in a roasting pan.
Season the inside of the chicken cavity with salt and pepper. Stuff with the onion, garlic, a few lemon slices, and 3–4 thyme sprigs.
In a small bowl, mix olive oil, melted butter, lemon juice, paprika, salt, and pepper.
Gently loosen the skin over the chicken breasts and rub some of the mixture under the skin. Rub the rest all over the chicken.
Tuck remaining lemon slices and thyme sprigs under the wings and legs.
Pour chicken broth into the pan around the chicken.
Roast for 60–75 minutes, or until internal temperature reaches 165°F (74°C) and skin is golden brown.
Baste the chicken once or twice with pan juices while roasting for extra flavor.
Let rest for 10–15 minutes before carving. Serve with roasted vegetables or crusty bread.