Preheat the oven to 350°F (175°C).
In a large bowl, mix together the ground beef, breadcrumbs, milk, eggs, onion, green bell pepper, salt, black pepper, garlic powder, and ground mustard until well combined.
Form the mixture into a loaf shape and place it in a baking dish.
In a small bowl, mix together the ketchup, brown sugar, and nutmeg. Spread this mixture over the meatloaf.
Bake in the preheated oven for 1 hour, or until the meatloaf is cooked through.
Let the meatloaf rest for a few minutes before slicing and serving.
Enjoy your delicious Cracker Barrel Meatloaf!