In a large bowl, mix together vanilla wafer crumbs, 1/4 cup sugar and melted butter until combined.
Line a 9x13 brownie pan with foil or parchment paper and spray with non-stick cooking spray.
Press the crumb mixture into bottom of the pan making sure to cover all of the pan.
Bake crust for 10 minutes and then remove from oven and cool.
Whisk together the peach nectar, flour, 2 1/2 cups sugar and eggs in large bowl until combined.
Pour onto cooled crust and bake for 30-35 minutes or until filling is set.
Let cool to room temperature. They can be stored in refrigerator.
Dust with powdered sugar before serving.
Notes
You can find peach nectar typically in the juice aisle in a can or a bottle. Pulse vanilla wafer cookies in food processor or blender to make crumbs for crust.