Crispy Stacked Potatoes with Garlic Parmesan Edges

Ingredients

• 2 lb (900 g) Yukon Gold potatoes, scrubbed
• 4 tablespoons (56 g) unsalted butter, melted
• 1 tablespoon olive oil, plus more for greasing the tin
• 3 cloves garlic, finely grated or minced
• 3/4 cup (75 g) finely grated Parmesan cheese, divided
• 1 teaspoon chopped fresh thyme
• 1/2 teaspoon finely chopped fresh rosemary
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 2 tablespoons finely chopped fresh chives
• Extra Parmesan, optional