Prepare the Crust:
Crush graham crackers into fine crumbs. Mix with sugar and melted butter.
Press firmly into a 9×13 pan and freeze for 20 minutes.
Make the Lemon Cheesecake Layer:
Whisk instant lemon pudding mix and half and half until thickened.
In another bowl, beat cream cheese and powdered sugar until smooth.
Fold the pudding mixture into the cream cheese, then stir in Cool Whip.
Spread over the chilled crust.
Add the Blueberry Layer:
Spread blueberry pie filling evenly over the cheesecake layer.
Top with Cool Whip:
Spread the remaining Cool Whip on top.
Chill and Serve:
Cover with plastic wrap and refrigerate for at least 8 hours (overnight is best).
Garnish with crushed graham crackers, blueberries, or lemon slices before serving.