Heat olive oil in a large, deep skillet or Dutch oven over medium-high heat. Add pancetta and chopped porcini mushrooms to hot pan and sauté until pancetta is nicely browned, approximately 4-5 minutes.
Add white wine and scrape up any brown bits from the bottom of the pan. Reduce heat to medium and simmer a few minutes until wine is reduced by half.
Add chicken broth, reserved liquid from dried mushrooms, Parmesan rind, bay leaves, fresh rosemary, and 2 cups cannellini beans. Stir to combine and season with salt and black pepper, to taste. Simmer for 20 minutes or until heated through.
While the soup simmers, add remaining cup of cannellini beans and a little water to a blender or food processer and puree until smooth. Stir into soup to thicken.
Add chopped kale and ½ cup grated Pecorino cheese and stir until cheese is completely melted and the kale is wilted, approximately 3-4 minutes. Taste and adjust seasonings, as desired. Remove from heat and discard the Parmesan rind and bay leaves. Serve immediately with remaining grated Pecorino cheese. Enjoy!