Italian Hamburger Deep Dish

This casserole is a weeknight workhorse. Seasoned ground beef gets layered between oregano-spiked mashed potatoes, fresh sliced tomatoes, and melted mozzarella in a deep baking dish. It’s hearty, uses mostly pantry staples, and feeds the whole family from one pan.

Instant mashed potatoes mixed with dried onion and oregano form the base and top layers. They set up firmer than scratch mashed potatoes during baking, creating a structure that holds the layers together when you scoop out a serving. Think of it as a shepherd’s pie with Italian flavors.

Browning the beef with garlic first builds a savory foundation. Drain it well because trapped grease between the potato layers turns the casserole soggy instead of bubbly. Fresh tomato slices layered in the middle and on top add brightness and acidity that cuts through the richness of the beef and cheese.

The mozzarella on top goes golden and bubbly during those 30 minutes uncovered, giving you a stretchy, melted cheese pull with every spoonful.

Pro Tips

• Make the instant potatoes slightly thicker than you normally would. They’ll loosen as they bake, and too-thin potatoes turn the casserole watery.
• Slice the tomatoes about ¼ inch thick. Too thin and they dissolve; too thick and they release excess juice.
• Let the casserole rest for 5 minutes after pulling it from the oven. The layers hold together better when slightly cooled.
• Drain the beef thoroughly. Press it with paper towels if needed.

Variations

• Use Italian sausage instead of ground beef for a spicier, more robustly flavored dish.
• Add a layer of sautéed spinach between the beef and potatoes for extra vegetables.
• Swap mozzarella for provolone for a sharper, smokier cheese layer.