Preheat oven to 350°F.
Place butter in cobbler dish and put in oven until melted.
Combine peaches, blueberries, sugar, cinnamon, ginger, cornstarch, lemon juice, and salt in a large bowl.
Remove cobbler dish from oven and fill with fruit mixture.
Pull biscuits apart (approximately 4 pieces per biscuit) and place randomly on top of fruit filling.
Place in oven and bake 45 minutes to 1 hour, or until the center of the cobbler is bubbling.
Remove from oven and garnish with powdered sugar. Allow to cool before serving.