Preheat oven to 35.In small saucepan combine berries and cornstarch; cook and stir until mixture thickens and is clear.In a separate bowl, beat egg yolks; stir in condensed milk and lemon juice.Pour into crust and bake 8 min.Spoon raspberry mixture over evenly. Chill 4 hrs or until set.Spread whipped topping over top.