Instructions:
Preheat the Oven:
Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish or a large cast-iron skillet.
Prepare the Filling:
In a large bowl, combine the sliced peaches, granulated sugar, brown sugar, lemon juice, vanilla extract, cinnamon, nutmeg, and cornstarch (if using). Toss everything together until the peaches are evenly coated.
Pour the peach mixture into the prepared baking dish or skillet.
Prepare the Topping:
In a medium bowl, whisk together the flour, granulated sugar, baking powder, and salt.
Add the chilled butter pieces to the flour mixture. Use a pastry cutter or your fingers to cut the butter into the flour until the mixture resembles coarse crumbs.
Pour in the boiling water and stir just until the dough comes together. The dough should be thick but spreadable.
Assemble the Cobbler:
Drop spoonfuls of the topping dough over the peach filling. It’s okay if the dough doesn’t cover the peaches completely; the gaps will allow the filling to bubble up and create a rustic look.
Sprinkle the 2 tablespoons of granulated sugar over the top of the dough.
Bake the Cobbler:
Bake in the preheated oven for 40-45 minutes, or until the topping is golden brown and the peach filling is bubbly.
If the top starts to brown too quickly, loosely cover the cobbler with aluminum foil.
Cool and Serve:
Remove the cobbler from the oven and let it cool for about 10-15 minutes. This allows the filling to set slightly.
Serve the peach cobbler warm, topped with vanilla ice cream or whipped cream if desired.