Place Popcorn In A Large Bowl. In A Microwave-Safe Bowl, Combine Corn Syrup And Butter. Cover And Microwave On High For 20-40 Seconds; Stir. Pour Over Popcorn; Stir To Coat. Immediately Add Colored Sprinkles, Sugar And Cinnamon; Toss To Coat. Transfer To Two Greased 15-In. X 10-In. X 1-In. Baking Pans; Let Stand For 1 Hour Or Until Dry. Store In An Airtight Container.