This was difficult for me as an Australian English speaker because I have never heard of "chocolate jam"! Google now informs me that Americans call CHOCOLATE SPREAD (like Nutella), "chocolate jam". Jam in our English is always made from fruit.

So I was assuming the sentence meant, "I am buying chocolate, jam and peanuts" - three items. I did choose the right translation when I couldn't find the translation I expected and realised there must be people who call it that...