Add 5 boneless skinless chicken breasts, 1 can diced tomatoes (14 oz), 1 can tomato sauce (8 oz), 2 tsp minced garlic, 2 tsp Italian seasoning, 1 tsp salt, and ½ tsp black pepper to the crock pot.
Cover and cook on low for 4–6 hours or on high for 3 hours.
In a small mixing bowl, whisk together 1 cup heavy cream and 1 Tbsp corn starch until smooth.
Stir the heavy cream mixture into the crock pot during the last 30 minutes of cook time.
Stir in 2 Tbsp fresh basil finely chopped before serving.