Place a large skillet over medium to medium high heat
While the skillet is warming, slice the sausages into rounds and then transfer into the skillet
Brown the sausages until caramelized and warmed through and then transfer onto a plate and set aside for now
Add 2 tablespoons of butter and a large diced yellow onion and cook for about 5 minutes or until the onions begin to soften
Add 4 cloves of finely minced garlic and cook for about 60 seconds while stirring constantly
Add 31 ounces of cannellini beans including the liquid from one can, 1/2 cup of heavy cream, 1 teaspoon of dried Italian herbs and a pinch of red pepper flakes and bring to a simmer
Transfer the browned sausage back into the beans and simmer for about 10 minutes or until the beans are tender and the sausage is warmed through
Turn the stovetop heat off, but leave the skillet over the burner and stir in 2 cups of chopped kale, arugula or spinach and 1 cup of finely shredded parmesan
Add salt and black pepper, if necessary