Is there anything more versatile than meatloaf? Any combination of ground meat, any additions, any toppings... as long as you put in a binder, you're good to go. Here's my favorite way of making meatloaf.
1 pound Hamburger
1 pound Turkey Burger
1 medium Onion (Diced)
1 15oz Can Diced Tomatoes
1 4.5 oz can Whole Mushrooms (optional)
Cheese Cubes (1/2" x 1/2" - I use four slices of cheese for this, Colby Jack to be specific)
1 Cup (plus - depending on the moisture content of other ingredients) Bread Crumbs or GF Panko
Salt, Pepper, Garlic Powder and Parsley to taste (as you can see from the pic, I use quite a bit of parsley)
1/2 Cup BBQ Sauce (of your choice) (divided)
Preheat oven to 350 degrees.
Place all ingredients except BBQ Sauce in a large bowl.
Get in there with your hands (or in this case The Man's hands) and mix all the ingredients together. Hands are the best tools!
Add more bread crumbs if you think the mixture is too wet.
Spray two loaf pans with cooking spray (I found it doesn't really matter if they're 8" or 9", the cooking time is the same)
Divide mixture evenly between the loaf pans and flatten out the top.
Spread BBQ Sauce onto tops of the meatloafs. I find it easiest if I use the back of a spoon.
Bake for 60 minutes.
Other things I've added to meatloaf include: Zucchini, small Broccoli flowerets, diced bell pepper, etc.
My grandmother uses a combination of 1/2 pound of hamburger, 1/2 pound of ground sausage and 1/2 pound of lamb burger.
Helpful Hack - if your meat has a high-fat content, put a piece of stale bread in the bottom of your loaf pan before adding the raw meatloaf, it will absorb all the grease.