Mix ground beef and sausage with bread crumbs, eggs, whole milk and grated parmesan, then mix in the seasonings until well combined.
Form into a loaf and place into a bread pan, then combine the sauce ingredients in a medium/small sized dish and set aside (refrigerate) for now.
Bake uncovered (*see note) for 50 minutes, then remove the meatloaf from the oven and pour the barbeque sauce over top. Return to oven and continue baking for 10 minutes more, or until internal temperature reaches 160 degrees.
Allow to cool slightly and then enjoy!
Notes
The amount of brown sugar added to the sauce can be adjusted to taste. If you are concerned about the top of the meatloaf getting too crisp in the oven, it can be covered with foil to bake. Remove foil after 50 minutes and add sauce, then continue baking until the meatloaf reaches 160 degrees. Step by step photos and notes below.