Brown the sausage in a Dutch oven over medium-high heat for 7 to 8 minutes until deeply colored and 160°F.
Transfer the sausage to a plate, add the olive oil and cook the onion for 6 minutes.
Stir in the garlic and crushed red pepper for 30 seconds, then add the broth and potatoes.
Simmer for 15 to 18 minutes until the potato slices bend and break easily.
Return the sausage, add the kale and simmer for 5 minutes until the greens soften.
Stir in the cream, salt and black pepper and warm to 165°F without a hard boil.