Mix the salt, black pepper, onion powder, and ground thyme. Set aside. Mix butter with the garlic and one teaspoon of the seasonings.
First, remove the giblets that come inside the chicken. Carefully lift the skin of the chicken. You can do this with your hands or with a butter knife. Take the butter and put it under the chicken skin. Do this on both sides of the chicken.
Add the oil to the rest of your seasonings and mix. Rub one teaspoon of the mix inside the chicken. Take the rest and rub it all over your chicken. Rub the oregano on the whole chicken.
Put the rosemary and lemon inside the chicken. Take a piece of cooking twine and tie the legs together.
Take your chicken and put it on a baking pan with a rack. Place your chicken in the bottom rack of the oven for 1 hour and 45 minutes.
After 40 minutes, baste your chicken. Rotate your pan so your chicken can get an even color.
After the chicken is done, let it rest for about 10 minutes. Serve and enjoy.
Notes
I usually cook the chicken for 20-22 minutes for each pound. If your chicken is bigger, just add more time accordingly.
If your chicken skin is already brown and you want to avoid burning it use foil. Loosely place a piece of aluminum foil over it. Remove it in the last 10 minutes of cooking so your skin can crisp.