Mix graham cracker crumbs, melted butter, and sugar; press firmly into a 9x13-inch dish and refrigerate 15 minutes
Beat cream cheese, powdered sugar, and vanilla until smooth and fluffy
Gently fold in whipped topping and spread evenly over the chilled crust
Spoon blueberry pie filling over the cream layer and spread gently to the edges
Cover and refrigerate at least 4 hours, preferably overnight
Notes
Fully soften cream cheese for a smooth textureDrain excess liquid from blueberry filling if neededOvernight chilling gives the cleanest slicesWipe the knife between cuts for neat presentation