All of the candy! No but seriously, I suppose I'd have to go with Reese's Peanut Butter cups and Kit Kat bars.
As for why, I'm not entirely sure but I can say that I've never been too big of a fan of chocolate only candies/baked goods, or chocolate on chocolate and If I do eat it, I can't eat a lot. When I eat chocolate, I always go for the chocolate separated by something else (Caramel, wafers, cookies, peanut butter, peanuts and almonds, etc). So, for example: While I don't eat a lot of regular, plain M&Ms, I absolutely love M&Ms with peanuts. ♥