Preheat oven to 350°.
Combine first 5 ingredients in a large bowl. Combine melted butter, honey, chili powder, and, if desired, ground red pepper, stirring well. Pour butter mixture over popcorn mixture, and stir to combine.
Spread mixture on a baking sheet lined with foil. Bake at 350° for 15 minutes. Cool and store in an airtight container.