Preheat the oven to 325F.
Wash and dice the stone fruit. Place them directly into the bottom of a 9'x9' baking dish, it should make a significant layer in the bottom. Toss with ¼ cup of sugar- depending on how sweet they are you can do more or less.
In a large bowl, make the biscuit topping. Whisk the flour, ½ cup of sugar, salt and baking powder, combine it well. Add the milk and melted butter and stir together. It will be thick and lumpy. If you need to add a little more milk, you can add a little at a time to get the thick lumpy consistency.
Spread the biscuit layer over the fruit and make sure to get the biscuit pushed into the corners. You want to cover the fruit completely.
Mix the corn starch and ¼ cup of sugar in a small bowl. Sprinkle evenly on the top of the cobbler. Pour the boiling water directly over the sugar/corn starch. Place immediately in the oven.
Bake for 50-60 minutes, until the top is golden brown and the corners are bubbling.
Let cool for 30 minutes and serve with ice cream or whipped cream. Enjoy!