Using a mortar or pestle, food processor or blender, combine sugar, salt, cinnamon Then grind or pulse until reduced to a fined powder (will take about 1 minute with a processor r blender).

Place hot popcorn in a bowl. Drizzle melted butter over popcorn, tossing to coat evenly.

While continuing to toss popcorn, sprinkling with cinnamon mixture until evenly coated.