- 8 cups popped popcorn, or more to taste
- 1 cup brown sugar
- 1/2 cup butter
- 1/4 cup corn syrup
- 1/4 teaspoon salt
- 1 tablespoon ground cinnamon
- 1 tablespoon vanilla extract
- 1/2 teaspoon baking powder
- 1 cup chopped walnuts (optional)
Preheat oven to 325 degrees F (165 degrees C). Lightly grease a baking sheet.
Place popcorn in a large bowl.
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Combine brown sugar, butter, corn syrup, and salt together in a saucepan; bring to a boil, stirring occasionally. Remove from heat and cool while stirring constantly for 2 minutes.
Stir cinnamon, vanilla extract, and baking powder into butter mixture. Pour butter mixture over popcorn and toss to coat. Mix walnuts into popcorn mixture. Spread popcorn in a single layer onto the prepared baking sheet.
Bake popcorn in the preheated oven until coating is set, 10 to 12 minutes. Cool slightly before breaking apart.