Preheat the oven to 350F.
In bowl, add melted butter, sugar, and stir it well till soft and light texture.
Add flour, salt, and combine everything very well.
Take a 913 baking pan, line it with parchment paper.
Press the flour mixture evenly into the bottom of the pan. Place the pan into the oven and bake it about 10mins in the preheated oven.
Remove from the oven and spread salty peanuts over it and keep aside.
In saucepan, add butterscotch or Caramel chips, butter, corn syrup and water.
Cook and stir it on medium flame until all melts properly.
Pour the melted chips mixture all over the peanuts; spread it using a spatula.
Dont worry about covering everything, it will fill while baking.
Bake it about 12-14 mins until bubbly around the edges.
Remove it from the oven, sprinkle with cardamom powder and let it cool completely.
Remove it from the pan and cut into bars. Store it in an airtight container.