keto soup recipe

- 1 lb mild Italian sausage - 4 slices thick-cut bacon, chopped - 1 small onion, diced - 3 cloves garlic, minced - 1 head cauliflower, chopped into florets - 32 oz beef bone broth - ½ cup heavy whipping cream - 2 cups fresh spinach (or kale) - Salt, pepper, and red pepper flakes to taste - Grated Parmesan for garnish (optional)