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Preheat oven to 250 degrees.
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Combine brown sugar, corn syrup or honey, pumpkin pie spice, and butter in a pan on the stove. Heat over medium heat until butter is melted and the mixture begins to bubble.
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Remove from heat and add orange extract or essential oil and baking soda.
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Pour over popcorn and stir until popcorn is evenly coated. Add mixed nuts if desired.
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Spread on foil-lined large baking sheet and put in the oven for 30 minutes, stirring every ten minutes.
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Remove from the oven and spread on a large piece of waxed paper or foil sprayed with non-stick cooking spray.
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Drizzle melted chocolate over the top if desired and let set and harden.
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Break into chunks and enjoy!