Load the Crockpot:
Place the chicken breasts, garlic, crushed tomatoes, tomato sauce, salt, pepper, Italian seasoning, and chicken broth into your slow cooker. Stir gently to combine.
Cook the Chicken:
Cover and cook on low for 6 hours or high for 3–4 hours, until the chicken is fully cooked and tender.
Shred the Chicken:
Remove the chicken from the crockpot and shred it with two forks. Return the shredded chicken to the soup base and stir.
Add Pasta and Cream:
Add the raw rotini pasta, parmesan cheese, and heavy cream. Stir to combine. Cover and cook on high for 30–40 minutes, or until the pasta is tender.
Prepare the Topping:
In a small skillet, melt butter over medium heat. Add bread crumbs and toast until golden brown, about 2–3 minutes. Set aside.
Serve and Garnish:
Ladle the soup into bowls. Top with a sprinkle of mozzarella cheese and toasted breadcrumbs for that signature Chicken Parmesan crunch. Serve hot.