In a bowl, whisk pudding mix and cold milk for 2 minutes. Let it thicken for 5 minutes.
Fold sour cream into the pudding mixture.
Layer half the cake cubes in a 9x13 dish.
Spread half the pudding mixture over the cake.
Add half the strawberry pie filling.
Repeat layers: cake, pudding, strawberry.
Top with whipped topping and spread evenly.
Chill for at least 4 hours or overnight.
Garnish with fresh strawberries before serving.
Notes
- Substitute Greek yogurt for a tangier flavor - Store covered in fridge for up to 3 days - Not recommended for freezing - Try different pie fillings for variety