Set oven to 375 degrees Fahrenheit.

Combine salt, lemon pepper, dried basil, and poultry seasoning in a small mixing dish. The hens should be covered in olive oil and seasoned with the salt mixture.

On a baking sheet pan, arrange the hens with lots of space between them. Use two pans if necessary. Add some celery, onion, and green bell pepper to the cavities of each bird.

The birds should be roasting in the preheated oven for about an hour, or until the juices flow clear and an instant-read thermometer put into the thickest part of the thigh reads 165 degrees F.

The birds should be taken out of the oven, loosely covered with foil, and given 10 minutes to rest before cutting or serving.