Creating Crockpot Italian Chicken is straightforward. Just follow these steps:

1. Prepare Ingredients: Chop the onion, bell pepper, and mince the garlic.
2. Layer Chicken: Place the chicken breasts at the bottom of the slow cooker.
3. Add Vegetables: Sprinkle the chopped onions, bell pepper, and minced garlic over the chicken.
4. Pour Sauces: Pour the marinara sauce and diced tomatoes on top.
5. Season: Add dried basil, oregano, red pepper flakes (if using), and salt and pepper to taste.
6. Cover and Cook: Cover the slow cooker and cook on low for 6-8 hours or on high for 3-4 hours.
7. Check Doneness: Ensure the chicken is fully cooked (internal temperature should reach 165°F or 75°C).
8. Shred Chicken: Remove the chicken, shred it with two forks, and return it to the slow cooker. Stir to combine.
9. Garnish: Add chopped parsley if desired.
10. Serve: Serve over cooked pasta, rice, or with bread.

These clear steps will lead you to your delicious Crockpot Italian Chicken effortlessly.