Heat oven to 350. Spray a deep dish pie pan w/ cooking spray. Cut apples into chunks, w/ peel on, Or you can peel, if you like. Toss apples w/ lemon juice.
In bowl, mix 2/3 cup Stevia w/ cornstarch. Toss w/ apples, mix well. Add berries. Spoon into crust. Top fruit w/ top crust.
Slice vents into top crust and brush w/ a little water. Sprinkle top w/ 1 tbsp stevia. Place pie pan on a baking sheet. Bake 40-45 mins, or until bubbly. Place foil around edges if browning too quick. Take foil off the last 10 mins.