Mom's Basic Meatloaf

1 pound ground beef 
2/3 cup milk 
1/2 cup cracker crumbs 
1/4 cup ketchup 
1/2 cup finely chopped onion 
1 teaspoon salt 
1/8 teaspoon black pepper 
1 egg, beaten 

Mix all ingredients together gently. 
Form into a loaf and place in baking dish. 
Top with additional ketchup if desired. 
Bake at 350° for about 1 hour. 
Serves 4.