Note: You must have a small food processor or mini blender for this component
Prepare a small tray or baking sheet with a silicone mat. Measure out peanuts so they are ready for the next step, as the process can happen quickly.
Begin cooking the granulated sugar in a small sauce pot over medium low heat. Pay close attention to it and stir frequently with a wooden spoon. It will be dry at first, and then will begin to clump up. Continue breaking up clumps and stirring.
Next, the sugar will begin to melt, continue stirring until the sugar is fully melted and has turned a deep amber color.
Immediately mix in the peanuts and quickly stir to coat. Quickly pour them out on to the silicone mat and spread out. Set aside to fully cool before moving to the next step.
Using a small food processor or strong mini blender, pulverize the peanut sugar mixture until a smooth paste forms. This can take a few minutes and may need a bit of stirring or scraping as you go to get the mixture to fully combine into a paste.
Place the white chocolate in a medium sized heat safe bowl, and microwave for 30 seconds. Stir, and microwave again for 20 seconds, and stir again.
Continue microwaving in 10 second increments, stirring after each, until the chocolate is fully melted.
Combine the peanut paste mixture with the white chocolate and the pinch of salt until fully incorporated.
Fold in the feuilletine flakes, and set aside at room temperature until cooled.
Spread the peanut feuilletine crunch layer in an even layer on the bottom of the pie.