Creating Cheesy Loaded Meatloaf Casserole is straightforward when you follow these steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C).
2. Prepare the Meat Mixture: In a large mixing bowl, combine ground beef, breadcrumbs, cheddar cheese, diced onion, eggs, ketchup, Worcestershire sauce, garlic powder, salt, and black pepper. Mix until well combined.
3. Add Vegetables: Gently fold in the mixed vegetables to the meat mixture, ensuring even distribution.
4. Shape Meatloaf: Transfer the meat mixture into a greased casserole dish, shaping it into a loaf.
5. Bake: Place the casserole dish in the oven and bake for 30 minutes.
6. Add Mashed Potatoes: After 30 minutes, carefully spread the prepared mashed potatoes over the top of the meatloaf.
7. Top with Cheese: Sprinkle mozzarella cheese evenly over the mashed potatoes.
8. Final Bake: Return the casserole to the oven and bake for an additional 15 minutes, or until the cheese is melted and bubbly.
9. Cool and Slice: Once finished baking, allow the casserole to cool for a few minutes before slicing it into portions.
10. Garnish (Optional): If desired, garnish with chopped parsley for a fresh pop of color.

By following these instructions, you’ll have a delicious Cheesy Loaded Meatloaf Casserole that’s sure to satisfy!