This is beyond easy. It takes more skill to clean the chicken than making this simple dish.
If you are buying chicken from an online store, then get chicken with skin, cut into biryani size pieces.
Take a bowl and combine together salt, paprika powder, garlic powder. If you are comfortable with the amount of seasoning , simply put these powders on top of the chicken. Drizzle some olive oil. Drop in black pepper corns, chilly flakes…whatever you want except the cat.
In a glass dish, spread out thick slices of onions. Put chicken on top of it. Cover the dish with aluminum foil. Put it into a preheated oven at 200C for about 30 minutes. Remove the foil at the half hour mark and then let it continue cooking for another 20 minutes. Remove the chicken pieces and return the dish with the onions and collected liquids into the oven. Now set the temp to the max that your oven can handle. Only top heat and broil this for about 4 minutes or so. This will reduce the liquids and char the onions a bit.