Pre-heat oven to 450
Crust: Cream together butter, vanilla & sugar. Blend in flour. Spread dough into the bottom & sides of a 9" tart pan with removable bottom.
Filling: Combine softened cream cheese with sugar & mix well. Add egg & vanilla & blend thoroughly. Pour filling into prepared crust.
Gently spread the blueberries over the filling. Combine 1/4 cup sugar & 1/2 tsp cinnamon in a small bowl. Sprinkle cinnamon sugar evenly over the blueberries.
Bake for 10 minutes at 450 degrees. Reduce oven temperature to 400 degrees and bake an additional 25 minutes.
Remove from oven & place on a rack to cool. Refrigerate at least 4 hours or overnight before serving.