1/4 cup granulated sugar, plus 1 1/2 tablespoons for sprinkling (raw sugar would be great for this too)
1/2 teaspoon salt
2 teaspoons baking powder
1 stick butter, cubed and chilled
3/4 cup buttermilk
1 egg white, for washing
Instructions
Preheat the oven to 375 degrees F.
In a large 13x9 baking dish, combine the peaches, brown sugar, cinnamon, and corn starch. Toss gently to combine.
In a large bowl combine the flour, sugar, salt, and baking powder. Cut in the butter with a fork, pastry blender or 2 knives until the dough resembles sand. Slowly add the buttermilk, stirring with a wooden spoon until the dough comes together. (You may not use all of the buttermilk.) With floured hands gently knead the dough together a bit until it comes together but is still sticky.
Scoop the dough into 4 inch (or so) biscuits and arrange over the peaches using your floured hands to flatten slightly if needed. Use the egg white as a wash, brushing on top of dough. Sprinkle the 1 1/2-tablespoons of sugar on top. Cook the cobbler until the top is golden brown, about 40 minutes.