1. In a large skillet, heat the olive oil over medium heat. Add the chopped onion and garlic, cooking until softened and fragrant, about 3-4 minutes.
2. Place the chicken breasts in the bottom of your slow cooker. Season with salt and pepper.
3. Pour the cooked onion and garlic mixture over the chicken.
4. Add the diced tomatoes, tomato sauce, chicken broth, dried oregano, and dried basil to the slow cooker. Stir to combine all ingredients.
5. Cover and cook on low for 6-8 hours or on high for 3-4 hours, until the chicken is thoroughly cooked and tender.
6. About 30 minutes before serving, stir in the heavy cream and fresh basil. Continue to cook on low for the remaining time.
7. If desired, sprinkle grated Parmesan cheese over the top just before serving.
Variations & Tips
If you have picky eaters in your family, try serving the chicken shredded and mixed into the sauce, which makes it great for spooning over pasta or rice. For a lighter version, substitute the heavy cream with half-and-half or a non-dairy alternative like coconut milk. You can also add extra vegetables like spinach, mushrooms, or bell peppers to make the dish even heartier and more nutritious.
