Crock Pot Chicken Parmesan Soup (Easy Slow Cooker Dinner)

Ingredients

• 1 1/2 lb (680 g) boneless skinless chicken breasts
• 1 jar (24 oz / 680 g) marinara sauce
• 1 can (15 oz / 425 g) crushed tomatoes
• 5 cups (1.2 L) low-sodium chicken broth, plus more for reheating
• 1 small yellow onion, finely diced
• 4 cloves garlic, minced
• 2 tablespoons tomato paste
• 2 teaspoons Italian seasoning
• 1 teaspoon kosher salt, plus more to taste
• 1/2 teaspoon black pepper
• 1/4 teaspoon crushed red pepper flakes, optional
• 6 oz (170 g) rotini or penne pasta
• 3/4 cup (75 g) freshly grated parmesan cheese
• 1 cup (115 g) shredded mozzarella cheese, for serving
• 1/4 cup chopped fresh basil or parsley
• 1/2 cup toasted panko breadcrumbs, optional for topping