Cook sausage, adding onion and garlic toward the end. Drain fat, mix in flour, and set aside. In a separate pot, add chicken broth, salt, and potatoes. Cook until potatoes are almost done. Stir in meat mixture, kale, oregano, and red pepper flakes. Bring to a boil to thicken slightly from the flour. Once boiling, turn off heat and stir in cream. Serve warm.