I don't roast the chicken bones but I do beef bones. I throw all my chicken bones into a crockpot with assorted veggie scraps. Whatever I have on hand. I add herbs and spices, top it off with water, and 1 to 2 tablespoons of ACV (this draws all the goodness out of the bones and doesn't effect the taste at all) set it in low, and leave it at LEAST 8hrs! Longer is even better then I filter it through a flour sack towel into my fat separator measuring cup, pour it into a sterilized mason jar, and put it in the fridge. End result is an awesome chicken broth gelatin! There are so many health benefits to this bone broth. Not to mention TONS of cooking options. I never add salt while it's cooking. That can be added to taste at time of use. My favorite use? A couple tablespoons in a coffee cup, add hot water (and salt to taste), and sip. SO nice on a cold day.
I strain mine through the veggie steamer basket for one of my cooking pots, put it in a large food prep container and let it rest until whatever else settles to the bottom and the fat rises to the top. Then I separate the layers ... the fat is useful. The middle is jelly, so rich.
I just made a big pot of rice with bone broth instead of water. Four cups of rice, Eight cups of the jelly ... hardly put a dent in my last batch of broth made from cockerel bones and feet. Yummy.
I'll make beans with the broth today.
Then I'll freeze the rest.
I love drinking hot broth, so freezing some in an ice cube tray would make that "easy."