sugar, corn syrup, molasses and salt to a medium saucepan set over medium heat. stir frequently as the butter melts to combine all the ingredients. bring the mixture to a boil (with the pan still over medium heat). once it reaches a boil, let it boil for 5 minutes without stirring. turn off the heat and stir in the baking soda, vanilla, and the spice mixture. the mixture will bubble and rise up. pour the caramel over the popcorn in the bowls. stir until the popcorn is well coated, working quickly.
transfer the popcorn to the two baking sheets and spread out evenly. bake for 60 to 75 minutes, stirring every 