Pastel de Papas (Beef Shepherd's Pie)

Ingredients (19 items)

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• 2 ½ pounds Yukon Gold potatoes, peeled and quartered
• 1 ½ teaspoons salt, divided
• ¾ cup milk, or as needed
• 3 tablespoons butter
• 1 tablespoon Parmesan cheese
• ¼ teaspoon ground black pepper
• ¼ teaspoon ground nutmeg
• 1 tablespoon olive oil
• 1 onion, chopped
• 1 red bell pepper, chopped
• 1 ½ pounds ground beef
• 2 teaspoons smoked paprika
• 1 teaspoon salt
• 1 teaspoon garlic powder
• ½ teaspoon ground black pepper
• 2 hard-cooked eggs, chopped
• ½ cup chopped green olives
• ½ cup cubed mozzarella cheese
• 1 tablespoon grated Parmesan cheese