Reduce the heat to medium, then add in the bacon. Cook until slightly crispy, then remove the bacon - however, you should leave the fat this time around. Add in the onions and garlic, and cook them for 5-7 minutes until softened.
Finally, add the chicken broth, bacon, potatoes, and kale - bringing the ingredients to a boil. Once the broth reaches a rolling boil, continue to simmer the soup, leaving the pot uncovered for 20 minutes until the potatoes are tender. Add the sausage and heavy cream, stir together, and serve.