In a large bowl, combine the graham cracker crumbs, butter, and sugar. Stir until all of the butter has been soaked into graham cracker crumbs.
Transfer the mixture to a 13x9 baking dish and press it into the bottom. It should spread to all the edges and be compacted enough to hold together. Set aside.
In a large mixing bowl, add the cream cheese and sugar. Beat together with an electric hand mixer until smooth.
Add in the vanilla and sour cream. Beat again to incorporate.
Switch to a rubber spatula and fold in the cool whip making sure to mix thoroughly.
Pour over the graham cracker crust and smooth it out with the rubber spatula
Pour the blueberry pie filling on top and carefully spread it to all edges.
Chill for at least 2-3 hours before slicing into squares and serving.