Preheat the oven to 375 degrees F. Line a baking sheet with parchment.
Thread the bacon slices onto 12-inch wooden skewers that have been soaked in water. Bake until cooked but not too crisp, 20 to 25 minutes. Let cool completely.
While the bacon is cooling, set a glass bowl over a pot of simmering water so that the bottom of the bowl is not touching the water. Add the white chocolate to the bowl and heat until melted.
Line another baking sheet with parchment. Dip the bacon strips in the white chocolate so they are mostly covered. Place on the parchment. Sprinkle the bacon with the chopped pistachios and use a rasp grater to grate the milk chocolate on top. Let the chocolate harden at room temperature before serving.