01 - Bring a large pot of salted water to a boil. Cook the gnocchi according to package instructions until they float to the surface. Drain and set aside.
02 - Heat olive oil in a large skillet over medium heat. Add the sausage, breaking it up with a spoon, and cook until browned and cooked through, about 5–6 minutes. Remove excess fat if needed.
03 - Add the butter, chopped onion, and garlic to the skillet. Sauté until the onion is soft and translucent, about 3 minutes.
04 - Stir in the chopped kale and cook until wilted, about 2 minutes.
05 - Pour in the heavy cream, bring to a gentle simmer, and cook for 2 minutes. Stir in the Parmesan cheese until melted and the sauce is creamy.
06 - Add the cooked gnocchi to the skillet, tossing gently to coat in the sauce. Season with salt, black pepper, and red pepper flakes. Heat through for 1–2 minutes and serve immediately.