Blackberry Cobbler Recipe with Fresh Peaches

Ingredients

• 3 cups fresh or frozen peach slices, peeled and pitted
• 3 cups fresh or frozen blackberries
• 1/2 cup sugar
• 1/2 cup brown sugar, packed
• 1/4 cup cornstarch
• 1/2 teaspoon cinnamon or nutmeg, ground
• 2 cups King Arthur unbleached all-purpose flour
• 1/3 cup sugar
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 3/4 stick cold butter (6 ounces), cut in small pieces
• 1 large egg, beaten with 3/4 cup whipping cream