In a large bowl, mix the ground beef, soaked breadcrumbs, chopped onion, garlic, eggs, Worcestershire sauce, salt, pepper, and dried thyme. Combine thoroughly until the mixture is evenly blended.
Step 4: Shape the Meatloaf
Form the meat mixture into a loaf shape in the prepared baking dish.
Step 5: Add the Topping
In a small bowl, mix together the ketchup, brown sugar, and Dijon mustard (optional). Spread this topping over the meatloaf.
Step 6: Bake the Meatloaf
Bake the meatloaf in the preheated oven for 50-60 minutes, or until the internal temperature reaches 160°F (71°C).
Step 7: Make the Mashed Potatoes
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While the meatloaf is baking, place the diced potatoes in a large pot and cover with cold water. Add a pinch of salt and bring to a boil. Cook for 15-20 minutes, or until the potatoes are tender. Drain the water, then mash the potatoes with milk and butter until smooth. Add salt and pepper to taste.
Step 8: Assemble and Bake
Once the meatloaf is done baking, spread the mashed potatoes on top of the meatloaf. Sprinkle the grated cheddar cheese over the mashed potatoes.
Step 9: Broil the Topping
Place the dish under the broiler for 3-5 minutes, or until the cheese is melted and bubbly.
Step 10: Rest and Serve
Allow the meatloaf to rest for about 10 minutes before slicing. Garnish with freshly chopped parsley.