The beauty of this recipe is that there is no egg, the one thing that can make vegan baking tricky sometimes. To make vegan Hello Dolly Bars, simply use plant-based butter or kosher margarine for the butter and use sweetened condensed coconut milk instead of regular. You'll notice that the cans of sweetened condensed coconut milk are a tad less than 14 ounces. Be sure to read the labels of the baking chips, cookies, or crackers you use to be confirm they are egg- and dairy-free.