Place butter, crushed candy, and salt into microwave safe bowl; cover bowl. Microwave on high in 30 second intervals, stirring after each interval until mixture is smooth, about 2-3 minutes.
Quickly drizzle hot butterscotch mixture over popcorn. Mix with a spoon. Cool before serving.
SNAPPY TIPS: The melted candy mixture will be VERY hot, so be careful.SNAPPY SUBSTITUTIONS: I used mushroom popcorn, but you can use any variety. You can also substitute your favorite hard candy in different flavors for a whole new snack.