Preheat your oven to 350 degrees Fahrenheit.
If you haven't done this yet, now's the time to grease your loaf pan.
A 9-inch loaf pan works great for this recipe.
In a large mixing bowl, combine the ground beef, bread crumbs, and chopped onion.
I find using a wooden spoon or clean hands works best.
The goal is a nice, even mixture.
Next, add eggs and milk to the meat mixture.
Make sure everything is well blended.
This step helps keep your meatloaf moist and perfectly textured.
Pack your meat mixture into the prepared loaf pan.
Mix together the ketchup, brown sugar, and mustard for the glaze.
Spread this evenly on top.
Bake in the preheated oven for about an hour or until the internal temperature reaches 160 degrees Fahrenheit.
Allow it to rest for a few minutes before serving for the best flavor.