Preheat oven to 325°F, lightly grease a baking sheet or line with parchment paper for easy clean up.
Place the popped popcorn in a large bowl.
In a medium saucepan add the brown sugar, butter, corn syrup, and salt. Place over medium heat and bring the mixture to a rolling boil, stirring frequently. Remove from heat and stir the mixture for 1 minute to cool it slightly.
Add the cinnamon, vanilla, and baking powder to the sugar/butter mixture. Stir to combine.
Pour the sugar/butter mixture over the popcorn and toss to coat. Spread the popcorn mixture in a single layer on the baking sheet. Bake for 10-12 minutes or until the sugar coating is set. (don’t overbake otherwise it will be HARD).
Allow the popcorn to cool slightly.
Drizzle the melted almond bark over the popcorn, let set and then serve!