Line baking sheet with foil, spray with cooking spray.
Place chicken bones on baking sheet, fat side up.
Sprinkle with salt and pepper.
Roast 375º until golden brown.
Chop vegetables into large chunks.
Place chicken, vegetables, parsley, bay leaf, thyme, and peppercorns into large pot.
Cover completely with cold water.
Bring to boil, then immediately reduce heat to simmer for 3-4 hours.
Strain stock, cool and store in refrigerator or freezer.