Line 3 baking sheets with parchment paper.
Divide popcorn between the baking sheets.
Add 1 C miniature marshmallows to each sheet.
Divide cinnamon bear pieces between each sheet.
Toss ingredients on each sheet to combine; set aside.
In a medium saucepan over medium heat, bring butter, sugar, and corn syrup to a boil, stirring continually. Reduce heat to low and simmer for 5 minutes. Stir continually.
Add vanilla and food coloring.
Pour hot sugar mixture over popcorn; stir carefully. The heat will melt the marshmallows.
Cool and enjoy!