Mix flour, sugar, salt, milk, and oil and press into pie pan (do not roll). Bake at 450°F for 8 to 10 minutes. Watch carefully – remove when top edges are light brown.
Mix sugar, water, and cornstarch; bring to a boil, until thickened. Remove from heat and stir in 3 tablespoons strawberry Jell-O (when using fresh peaches, use peach Jell-O). Cool completely.
Fill cooled pie crust with fresh sliced strawberries. Pour liquid over berries making sure all are covered completely. Refrigerate until set. Serve with Cool Whip.