Line a 9x9 baking pan with foil and lightly grease.
In a large bowl, mix together quick cooking oats, puffed rice cereal, pumpkin seeds, and chopped candy corn.
In a small saucepan over medium-high heat, stir together butter, brown sugar, honey, and cinnamon. Let mixture come to a boil, then lower heat and let simmer for about 2 minutes.
Pour liquid mixture over dry ingredients and stir well to coat well.
Press mixture evenly into the prepared pan.
Place pan in refrigerator for at least 30 minutes to allow granola bars to cool and harden.
Remove to cutting board and cut into 12 pieces.