1Preheat the oven to 200°C. Arrange the boiled potatoes in a parchment-lined 26 cm baking dish, smash them to form a crust, drizzle with olive oil, and season with salt and pepper.
2Bake the potato crust for 15–20 minutes until lightly golden.
3Cut the salmon into bite-sized cubes and blanch the broccoli in boiling water for 2–3 minutes.
4Whisk together the eggs, cream cheese, milk, lemon zest, lemon juice, and parsley, and season with salt and black pepper.
5Arrange the salmon and broccoli over the crispy potato crust and pour the creamy egg mixture evenly over the top.
6Sprinkle with mozzarella and bake at 190°C for 25–35 minutes, until the filling is set, the salmon is cooked through, and the cheese is golden.
7Let the pie rest for 5–10 minutes, sprinkle with freshly grated Parmesan, and serve.