Perfect Peach Cobbler

Bahan-bahan (8 porsi)

• 4 pounds fresh peaches, sliced 1/2-inch thick
• 1/4 cup granulated sugar
• 1/4 cup packed light brown sugar
• 1 tablespoon cornstarch
• 2 teaspoons vanilla extract
• 1/2 teaspoon fine sea salt
• 1/2 teaspoon ground cinnamon
• 2 cups (240g) all-purpose flour
• 1/3 cup granulated sugar
• 2 teaspoons baking powder
• 1/2 teaspoon fine sea salt
• 1/2 cup cold unsalted butter, cut into 1-tablespoon chunks
• 2/3 cup cold buttermilk, plus extra for brushing
• 2 tablespoons turbinado sugar