It can be whatever. Junk foods, healthy foods. Doesn't matter. My second favorite is homemade granola. Wife puts together an awesome mix with cranberries and carob instead of chocolate. Simply yummy!
Hard to nail it to a specific thing, but I just like junk food in general Luckily my metabolism agrees with my decision to eat all sorts of junk food. Recently, I'm a fan of potato chips, pistachios (these things are pretty addicting), pretzels, fruits (bananas, pineapples, grapes, apples), chex mix, cookies, etc. Lol.