Cornbread Pecan Dressing with crumbs

12 tablespoons butter (1 1/2 sticks) 2 cups finely-chopped yellow onions 3 tart apples , cored and chunked, but not peeled (Jonathan, Winesap or Granny Smith)[...]

1 (16 ounce) package ground pork sausage 1 large onion , chopped 2 large celery ribs , chopped 2 lbs pepperidge farms cornbread stuffing mix 1 1/2 cups[...]