Add the garlic: Incorporate the minced garlic into the skillet and cook for another minute until it’s fragrant.
Brown the sausage: Add the ground Italian sausage to the skillet. Cook until browned and cooked through, about 5 to 7 minutes, draining excess fat if needed.
Combine in the slow cooker: Pour the sausage mixture into a slow cooker. Add the diced butternut squash, chopped carrots, celery, broth, thyme, basil, salt, and pepper. Mix everything well.
Slow cook to perfection: Set the slow cooker to low for 6 to 8 hours or high for 3 to 4 hours.
Stir in greens and vinegar: During the last 30 minutes of cooking, stir in the chopped spinach and balsamic vinegar.
Taste and adjust seasoning: Before serving, taste the soup and adjust the seasonings as needed.
Notes
Serve with crusty bread or a garden salad. Leftovers can be stored in the fridge for up to 4 days or frozen for 3 months.