There are as many meatloaf recipes as there cooks.
They're all good.
Basic is Meat and the spices you like. Expand from there.
Here's one I work from.
1 1/2 pound ground beef
1/2 cup chopped onion
1/4 cup dry bread crumbs
1/4 cup ketchup
1 teaspoon salt
1/4 tsp. basil
1/8 tsp. pepper
1'2 tsp. salt
1 1/2 cup mashed taters
1/4 cup shredded chedder cheese
Preheat oven to 350 f.
Grease 9x5 pan
Combine meat mixture and press into 1/2 of pan.
Add potato filling and top with remaining meat mixture.
Bake at 350 f for 50 to 60 minutes.
Let cool and invert onto serving plate.
Experiment and enjoy.