Why is the chocolate at the bottom of a Reese's Peanut Butter Cup often melty?

My guess is that the oils in the peanut butter sink down into the bottom of the chocolate and cause it to seem melted

But I DO freeze mine so i never have this problem :)

I would suspect the peanut oil breaking down the chocolate.

Compelling theory… but then, based on the organic peanut butters I’ve enjoyed, doesn’t peanut butter oil rise to the top, not sink to the bottom?

We should send a link to this question to the company that makes them!

I’m gonna guess a combination of exposure to peanut butter and being covered by the wrapping. Less air getting to it might be part if it…..?

Yeah, I’m not certain about the peanut oil theory. Peanut oil is less dense than the peanut butter mass, so within the center the oil should rise over time.

My guess is that the thickness/density of the chocolate over most of the peanut butter cup raises it’s melting point, but that the relative thinness at the bottom means it melts easier (and at room temp).

@fury, interesting theory re: the thinness affecting the melting temp.

It does appear that, where the chocolate is thickest, it’s also firmest. But then, the thickest points are the farthest from the center. So maybe it’s distance from the core of peanut buttery goodness?

What a tasty conundrum! I think I need to get some more experimental test subjects going here.

First; is a person holding this candy and if so I think their body temp will cause the chocolate to melt quicker

They are holding it in their hands, correct?

@sccrowell, nope… room temp, sitting on a table. Only held long enough to unwrap. And it’s too dang tasty to dawdle with the wrap.

I have made these at home and if it is anything like the factory process, you first coat the waxed paper cup with chocolate, let it harden (can be in the fridge) and then fill it with the peanut butter mixture, which is white chocolate coating and pb. You then top it off and seal it with another coat of chocolate. My it could be something to do with the waxed paper and not as much air getting to the bottom as to the top.

When I make these for gifts for pb/choco lovers, I use the Tupperware biggie funnel, (which turned upside-down is in the shape of a kiss) plug the hole with foil and make a huge peanut butter kiss out of it. The reaction is priceless.

@Seesul, Ohhhhh Myyy gosh!!! That sounds soo yummy!!!! This coming from a Full Fledge Chocoholic! My mouth is salivating as I write this… :)~ yummy!