Add the mushrooms and kale to the pot, and mix until the ingredients cook down, about 5 minutes.
Add beans, stock, and salt to pot and simmer for 10 minutes.
Add pepper flakes for desired heat and serve.
Notes
This recipe can be made with dry beans, however they should be cooked separately and added in, or add an additional 1-2 cups of stock as the beans will soak some of it up while cooking.