Baked Mashed Potatoes with Peas, Parmesan Cheese and Breadcrumbs

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1 tablespoon unsalted butter, at room temperature, for greasing the baking dish

Potatoes:

1 tablespoon unsalted butter, at room temperature

2 teaspoons kosher salt, plus extra for seasoning

4 pounds russet potatoes, peeled, cut into 1-inch pieces

1 1/2 cups grated mozzarella

1 cup whole milk, at room temperature

3/4 cup freshly grated Parmesan

1/2 cup (1 stick) unsalted butter, melted

Freshly ground black pepper

Peas:

2 tablespoons unsalted butter, at room temperature

2 cups frozen peas, thawed

1/2 teaspoon kosher salt

1/4 teaspoon freshly ground black pepper

Topping:

1/2 cup freshly grated Parmesan

2 tablespoons plain dry breadcrumbs

Extra-virgin olive oil, for drizzling