Mom's Chocolate Peanut Butter Bars

I have 3 versions of Chocolate Peanut Butter Bar recipes.  One is from here Katie added to a comment under a Choc PB bar Eileen posted.  One is in my hand writing, from Mom's house before I got married (1 1/2 sticks butter, 18 oz PB, 1 pack Graham crackers, 1 LB confectioners sugar)  and then I have a 3rd off of a Nestle's chocolate chip package.  As a non chocolate lover, I don't make them often however, whichever one I've used in the past (2 or 3 times) they came out very crumble.  The bars didn't hold together, I was quite disappointed with the results.  Therese has requested them and I'd love to bring them with us next Saturday for Parent's weekend.  Can someone who makes them regularly confirm the recipe?