Spray a slow cooker crock with nonstick cooking spray. Add berries, cornstarch and lemon zest to crock. Stir until evenly coated.
In a medium bowl, combine flour, oatmeal, sugar, brown sugar, baking powder and ginger. Gradually stir in milk and butter. Spoon over berries in crock.
Cover slow cooker and cook on HIGH for 2 hours or LOW for 3 hours.
Spray a slow cooker crock with nonstick cooking spray. Add berries, cornstarch and lemon zest to crock. Stir until evenly coated.
In a medium bowl, combine flour, oatmeal, sugar, brown sugar, baking powder and ginger. Gradually stir in milk and butter. Spoon over berries in crock.
Cover slow cooker and cook on HIGH for 2 hours or LOW for 3 hours.