Preheat oven to 350F
In a 9x13” baking dish, scatter onion and place cut butter pieces on top
Bake for 15 mins, or until you see some brown pieces of onion.
Mix your spices for the chicken rub
Rub chicken pieces on both sides with a spice mix
Place rice on top of baked onions and mix
Add chicken stock, garlic and water to rice
Place chicken pieces on top of rice mixture
Cover with foil and bake for 30 minute
Remove foil, spray thighs with oil spray and bake 20 minutes more, uncovered.