Step 1: Prepare the Mashed Potatoes
- Boil the peeled potatoes until fork tender.
- Drain well and mash with butter and milk.
- Season with salt and pepper.
- Set aside.
Step 2: Cook the Meat Filling
- Heat olive oil in a large skillet over medium heat.
- Sauté the onions for 3–4 minutes until soft.
- Add the garlic and cook for 30 seconds.
- Stir in the carrot and bell pepper and cook for another 4 minutes.
- Add the minced beef and cook until browned, breaking it apart as it cooks.
- Mix in the tomato paste, paprika, Italian seasoning, oregano, salt, and pepper.
- Simmer for 5 minutes until most of the liquid has evaporated.
Step 3: Make the Cheese Sauce
- Melt the butter in a saucepan over medium heat.
- Whisk in the flour and cook for 1 minute.
- Slowly pour in the milk while whisking constantly.
- Cook until the sauce thickens.
- Stir in the mozzarella, cheddar, nutmeg (if using), salt, and pepper.
- Continue stirring until smooth and creamy.
Step 4: Assemble the Casserole
- Preheat your oven to 190°C (375°F).
- Lightly grease a 9×13-inch baking dish.
- Spread the meat mixture evenly across the bottom.
- Cover with the mashed potatoes, smoothing the surface.
- Arrange the cheese slices over the potatoes.
- Pour the creamy cheese sauce evenly over the top.
- Sprinkle with the remaining shredded cheddar.
Step 5: Bake
- Bake for 25–30 minutes until bubbly.
- Broil for 2–3 minutes to create a beautifully golden, cheesy crust.
Step 6: Serve
- Let the casserole rest for 10 minutes before slicing.
- Garnish with freshly chopped parsley.
- Serve warm with a crisp green salad or steamed vegetables.
Tips
- Swap the beef for ground turkey or chicken for a lighter version.
- Add mushrooms, corn, or peas to the filling for extra vegetables.
- Prepare the casserole a day ahead and refrigerate until ready to bake.
- Leftovers keep well in the refrigerator for up to 3 days and can be reheated in the oven or microwave.
This comforting casserole combines seasoned minced beef, creamy mashed potatoes, and a rich homemade cheese sauce for a satisfying family dinner with a golden, bubbly topping.