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Place the popped popcorn in a large bowl and salt to taste (skip this step if you have salted popcorn). Set aside.
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Mix the honey and sugar in a small saucepan and bring to a boil. Let it simmer for about 2 minutes, then remove from the heat and add the peanut butter. Stir vigorously until all the peanut butter is melted, then mix in the vanilla extract.
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Immediately pour the peanut butter caramel over the popcorn and gently stir with a long-handled wooden spoon until it's all coated. Spread popcorn on a large baking sheet over a piece of wax or parchment paper. Drizzle popcorn with melted chocolate and let sit until chocolate hardens (I stuck it in the freezer for a couple of minutes to speed it along). Stir in the Mini Reese's Peanut Butter Cups. You can also use chopped Reese's Cups if you can't find the Mini size.