In a very large bowl, mix the popcorn, pretzels, peanuts, candy corn and Reese’s Pieces; spread out onto two large rimmed baking pans.
In a large saucepan, over medium-high heat, melt the butter.
Add the honey and sugar; stir until smooth.
Stop stirring; allow the mixture to come to a boil; cook for about 5 minutes, tilting the pan occasionally to make sure there are no signs of burning.
The mixture should smell caramelized and be a bit darkened in color.
Remove from the heat and carefully stir in the peanut butter, salt and heavy cream.
Quickly drizzle the peanut butter caramel over the party mix on the sheet pans; toss to coat with two large spoons.
Let the party mix cool on the sheet pans; transfer to bowls for serving, breaking up any large pieces, if needed.