01 - Preheat oven to 190°C. Lightly grease a 23x33 cm baking dish.
02 - In a large bowl, gently toss sliced peaches with granulated sugar, brown sugar, lemon juice, ground cinnamon, ground nutmeg, cornstarch, and a pinch of salt until well coated.
03 - Spread the peach mixture evenly into the prepared baking dish.
04 - In a separate bowl, whisk together flour, granulated sugar, baking powder, and salt. Add the cold butter and cut it in using a pastry cutter or fingertips until the mixture forms coarse crumbs.
05 - Pour in the milk and vanilla extract. Stir just until the dough is combined and soft. Avoid over-mixing.
06 - Drop spoonfuls of biscuit dough over the peach filling, leaving gaps for steam to escape.
07 - Sprinkle 13 grams granulated sugar evenly over the dough.
08 - Bake in the preheated oven for 40 to 45 minutes, or until the topping is golden brown and the peach filling is bubbling.
09 - Allow the cobbler to cool for at least 15 minutes before serving. Serve warm, ideally with vanilla ice cream.