Heat olive oil in a large skillet over medium heat.
Add onions and garlic, sauté until translucent.
Stir in bell peppers and cook for 3-4 minutes.
Add shredded chicken and mix well with vegetables.
Pour in chicken broth and bring to a simmer.
Add cherry tomatoes and Italian seasoning.
Season with salt and pepper to taste.
Combine cooked spaghetti with the chicken mixture.
Toss everything together until well coated.
Serve hot, garnished with fresh herbs if desired.