Season both sides of chicken with salt, pepper and garlic powder.
Place seasoned chicken in a single layer in a 9 X13 pan.
Place onions on top of the chicken.
Pour enough chicken stock over the chicken to cover the chicken.
Place a lid on the pan and put into preheated oven for about an hour.
After an hour, remove a little of the stock so that the top of your chicken is not in the liquid and place lidded back into the oven for about 30 minutes.
Place biscuits over the top of the chicken, trying not get liquid on the biscuits.
Return to the oven for approximately 16-18 minutes, or until the biscuits are golden brown.
Serve chicken with biscuit and a side of mashed potatoes.
If you choose to, you can use the previously removed stock and thicken with a tablespoon or so of corn starch or flour to make a heavier gravy.