01 -
Preheat the oven to 400°F and position the rack in the middle. Grease a 9x13 inch casserole dish and add the diced potatoes evenly.
02 -
In a skillet, cook ground beef and chopped onions over medium heat, breaking up the meat until browned, approximately 8 to 10 minutes. Drain excess fat if necessary.
03 -
Stir in minced garlic and frozen mixed vegetables. Continue cooking for 2 to 3 minutes while stirring frequently. Season with salt and pepper, then transfer this mixture to the casserole dish over the potatoes.
04 -
In a medium bowl, blend condensed cream of mushroom soup, milk, sour cream, Worcestershire sauce, Italian seasoning, and half of the shredded cheddar cheese until smooth.
05 -
Pour the prepared sauce over the beef and potato layers. Stir gently to combine and flatten the mixture evenly in the dish.
06 -
Cover the casserole tightly with foil and bake in the preheated oven for 45 minutes.
07 -
Remove the foil, sprinkle the remaining shredded cheddar cheese on top, and bake uncovered for an additional 10 to 15 minutes until the cheese melts and potatoes are tender.
08 -
Allow the casserole to rest for 5 to 10 minutes before serving. Adjust seasoning with extra salt and pepper as needed.