In a small frying pan or saucepan, melt the butter over low heat.
Once the butter begins to melt, stir in the condensed mushroom soup until combined.
Add the dried parsley, thyme, and red pepper flakes to the pan, stirring well to incorporate the spices into the sauce.
Place the caramel popcorn in a large mixing bowl.
Pour the warm soup mixture over the popcorn, tossing gently but thoroughly to ensure an even coating.
Gently fold in the pretzel mix until it is well distributed.
Transfer the mix to a serving bowl, sprinkle with extra red pepper flakes if desired, and serve immediately.