Preheat oven to 375 degrees Fahrenheit.

Prepare stuffing mix according to package directions. If using leftover stuffing, roughly break it up to approximately 2 cups.

Set aside the prepared stuffing.

In a medium skillet, melt butter over medium heat.

Add chopped onions and mushrooms to the skillet.

Cook the onions and mushrooms until soft and tender, about 10 minutes. Season lightly with salt and pepper.

Remove 2 tablespoons of the cooked onion/mushroom mixture and add it to the prepared stuffing.

Roughly tear the bread and place it in the milk. Let it soak while the onions and mushrooms cook.

In a large mixing bowl, place the ground beef.

Break up the ground beef slightly so the seasonings can be easily mixed in.

Season the beef with the remaining salt and pepper.

Add the milk-soaked bread, cooked onions, mushrooms, and beaten eggs to the ground beef.

Mix thoroughly until all ingredients are well combined.

Divide the meat mixture in half.

Spread one half of the meat mixture onto a long sheet of plastic wrap, forming an approximately 8" x 12" rectangle.

Mix the 2 tablespoons of onion/mushroom mixture lightly into the stuffing.

Spread the stuffing mixture evenly over the bottom layer of meat.

Top with the remaining meat mixture.

Shape the meat to cover the stuffing layer completely and seal the top to the bottom layer.

Taking the shorter end of the meatloaf, start rolling slowly until you have a complete log.

Place the meatloaf in a lightly sprayed 10" x 15" casserole dish.

In a separate bowl, combine the cream of mushroom soup, condensed golden mushroom soup, Worcestershire sauce, and milk to create the topping mixture.

Cover the meatloaf with the topping mixture.

Cover the casserole dish tightly with aluminum foil.

Place the dish on a lined baking sheet.

Bake for approximately 1-1/2 hours, or until the meatloaf is done.

Drain the grease from the dish (using a gravy fat separator is recommended).

Spoon the gravy over the meatloaf.

Slice the meatloaf and serve hot.

For crock pot cooking, follow all the above steps, and then bake approximately 6-8 hours on low (adjust cooking time depending on your crock pot's settings).