Purple Sweet Potato Pie

Ingredients

• 1-pound purple sweet potato, skin on
• 1 stick unsalted butter, melted
• 1 cup granulated sugar
• ½ teaspoon ground cardamom
• 1 teaspoon ground ginger
• ½ teaspoon kosher salt
• 1 teaspoon fresh orange zest
• ½ cup whole milk, room temperature
• 2 large eggs, room temperature
• 1 prepared pie crust
• Granola and fresh thyme for decoration (or you can leave it plain)