I used the exact amount of chocolate the recipe calls for, but I think creating a very thin layer of chocolate helped them stay together. (marthastewart.com)
Then I topped the bars with a very thin layer of chocolate and then a little swirl made from melted peanut butter chips. (chezcateylou.com)
Spread a very thin layer of chocolate frosting all over the top and sides of the cake — this is the «crumb coat,» to lock in any stray crumbs from the cake. (thespruce.com)