Prep the Chickens
Preheat oven to 425°F (220°C).
Pat chickens completely dry inside and out.
Rub olive oil or butter over the skin.
Mix salt, pepper, paprika, thyme, and rosemary.
Season generously inside and out.
Stuff cavities with onion, lemon, and garlic.
Tie legs loosely with kitchen twine.
Roast
Place chickens breast-side up on a rack in a large roasting pan.
Roast at 425°F for 20 minutes.
Reduce heat to 375°F (190°C).
Continue roasting 60–75 minutes more.
Rotate pan halfway through for even browning.
Check for Doneness
Internal temperature should reach 165°F (74°C) in thickest part of thigh.
Juices should run clear.
Skin should be deep golden and crisp.
If browning too quickly, tent loosely with foil.
Rest
Remove from oven and tent with foil.
Rest 15–20 minutes before carving.
Reserve pan drippings for gravy.