Position oven racks near the center of the oven to allow room for the two pans.
Preheat oven to 450°F Line 2 jelly roll pans (low-sided baking pans) with foil; spray with a cooking oil spray, such as Pam.
In a large bowl, combine the meats, eggs, soup mix, breadcrumbs and milk. Make sure it's very well mixed - you don't want to see streaks of turkey or beef. A stand mixer with a paddle blade on low speed makes quick work of it.
At this point, you can form the meat mixture into one meatloaf and meatballs as I do, or all meatballs or two meatloaves as you wish. Meatloaf should be formed directly on a jelly roll pan. Shape it into an oval about 3" high. Please don't use a loaf pan. Cooking it in a loaf pan will result in a steamed texture. Cooking it in an open pan will allow a nice brown crust to form.
Spray top and sides of meatloaf with Pam.
Put meatloaf into the oven and REDUCE oven temperature to 375°F Bake 45 - 60 minutes. Test for doneness with thermometer - 160°F.
Remember, this contains poultry, it MUST be well done. When done, remove to a platter, slice and serve with gravy. To freeze, slice, allow to cool and wrap individual slices airtight. Thaw before re-heating.
While the meatloaf starts cooking, form the rest of the meat mixture into 1" meatballs. A small ice cream style scoop works well and makes uniform sized balls. Place the balls on a jelly roll pan. Spray meatballs with Pam and bake 30 - 40 minutes, turning after 20 minutes. Test for doneness (160F). Freeze meatballs on the pan, after they are frozen, remove to a ziptop freezer bag.
To serve, combine gravy ingredients in a large saucepan. Bring to a boil, reduce to a simmer. Bring a large pot of water to a boil, add frozen meatballs and simmer for 7-10 minutes, then drain and add to gravy. Good with noodles.