Last week I made it..I modified this recipe as per my taste and availability of ingrediants over here...The original recipe calls for marshmallows..But I substituted it with peanut butter..The peanut butter which I used is not the store bought stuff,this is a homemade peanut butter,I have posted the recipe for this in my previous post do check that or just click this link to check the recipe.The original recipe calls for half of normal sugar and half of brown sugar..In my place I could not found brown sugar so I substituted it with Jaggery and Honey,still it cameout great..If you are pure vegetarian,you could substitute eggs with a little milk or cream
for step by step recipe check my blog http://yummytummy-aarthi.blogspot.com/2011/07/chocolate-peanut-butter-bars.html