Peach Cobbler

6 large peaches, cut into thin wedges
1/4 cup sugar
1 tablespoon fresh lemon juice
1 teaspoon cornstarch

For biscuit topping

1 cup all purpose flour
1/2 cup sugar
1 teaspoon baking powder
1/2 teaspoon salt
3/4 stick cold unsalted butter, cut into small pieces
1/4 cup boiling water

Cook peaches:
Preheat oven to 425 degrees
Toss peaches with sugar, lemon juice, and cornstarch in a 2 qt nonreactive baking dish and bake in middle of oven for 10 minutes.
Make topping while peaches cook:
Stir together flour, sugar, baking powder and salt.
Blend in butter with your fingertips or a pastry blender until mixture resembles coarse meal.
Remove peaches from oven and drop spoonfuls of topping over them. Bake in middle of oven until topping is golden, about 25 minutes. (Topping will spread as it bakes.)