Or you can make meatloaf in a round baking dish and carve out a hole in the middle. It won't go closed while it's baking.
The hole in the middle just assures that it will get done--there won't be a middle section that will still be partly raw. Do this when baking meatloaf in a microwave,or if you bake it in less time than called for in the recipe.
I make the Betty Crocker basic meat loaf recipe from her cookbook (or maybe it's on the web site). A former neighbor used to grate in to the ground beef mixture one dill pickle spear (maybe a couple of tablespoons worth?). That added a little zip to the baked meatloaf.
Others bury a hard-boiled egg in the mixture before baking or lay bacon strips across the top or use BBQ sauce instead of ketchup or add any ingredients that will please the family.
Here's Betty Crocker's recipe (I omit some of these ingredients because of my family) which I double so I have cold meatloaf left over for sandwiches the next day --
Savory Meat Loaf Recipe from Betty Crocker