I have made this a few times for parites and it's always a big hit!
If you follow this recipe, it shouldn't be too hot. We like it hot, and I would add a third jalepeno next time. Although it does depend a lot on the individual peppers- some are evil and some are mild!
Original recipe from allrecipes.com-
2 - 8oz. packages lowfat cream cheese, softened
<1 cup lite mayonnaise
1 - 4.5 oz. can chopped green chilies, drained
2 fresh jalapeno peppers; diced (in food processor is best)
1 cup grated Parmesan cheese