Chop the onion, and thinly slice the potatoes. Set aside.
Lightly spray or use 1 teaspoon of olive oil in a large heavy pot. Brown the sausage. Add in the onion and garlic when the sausage is about halfway done.
Drain if there is tons of grease. I rarely drain, because there is not a ton of grease usually. Pour in the chicken broth, add in the potatoes. Let simmer for about 20 minutes till the potatoes are fork tender, but not falling apart.
Add in the cream and kale. Let simmer for about 5 minutes.
Add 1-2 shakes of Cayenne. Taste to see if it needs salt. I never add salt.