Years ago, Kenji J Lopez from Serious Eats came up with a solution for avoiding a mushy burger. He dehydrates the beans in the oven until they are dry and bursting open. I have tried this genius step and it does work. The problem is the beans are so dry I find it makes these patties taste dry too because there isn't a lot of wet ingredients added. I also wanted to create a recipe with the fewest steps possible. If you want to try this step, just place the drained and rinsed black beans on a sheet pan and bake in a preheated 350ºF oven for 20-25 minutes. Proceed with the recipe from here.