In a large mixing bowl, combine the ground beef, bread crumbs, ketchup, diced onion, diced green bell pepper, egg, Worcestershire sauce, salt, and pepper.
Mix all the ingredients together until well combined.
Shape the mixture into a loaf and place it in a loaf pan.
Top the meatloaf with additional ketchup, if desired.
Bake in the preheated oven for about 1 hour, or until the internal temperature reaches 160°F (70°C).
Let the meatloaf rest for a few minutes before slicing and serving.