Halloween - Too much, but my VERY favorite would most definitely be those little packets of life savers. Ohhhhh lawd.
Thanksgiving - Snicker Salad (The name is fairly repulsive, I realize), it's composed of Snickers, very small apple slices and a secret recipe for a fantastic whip-cream like custard that blends it all together flawlessly.
Christmas - Everything chocolate covered (pretzels specifically) and grandma's home made cinnamon rolls.