I start by cooking the sausage in a skillet until golden, then add onions and sauté until soft. This step builds the foundation of flavor.
Next, I stir in the minced garlic and cook briefly—just enough to release its aroma without burning.
I transfer the sausage mixture to the slow cooker, then add diced potatoes, chicken broth, salt, pepper, and red pepper flakes. I let it cook on low for about 4 hours.
Near the end, I fold in the chopped kale, heavy cream, and freshly grated Parmesan. This gives the soup its creamy, luscious texture and vibrant color.