Creating Slow Cooker Tomato Basil Chicken Breasts is straightforward if you follow these simple steps:

1. Prepare the Slow Cooker: Lightly grease the inside of your slow cooker with cooking spray or olive oil.
2. Season the Chicken: Pat the chicken breasts dry with paper towels. Season both sides with salt, pepper, and oregano.
3. Add the Chicken: Place the seasoned chicken breasts in the slow cooker.
4. Add Tomatoes: Pour the diced tomatoes over the chicken. Do not drain the tomatoes; the liquid will help to cook the chicken.
5. Add Garlic and Basil: Sprinkle the minced garlic and chopped basil over the top of the tomatoes.
6. Add Olive Oil: Drizzle the olive oil over the mixture for added flavor and moisture.
7. Cook: Cover the slow cooker and cook on low for 4 to 6 hours or on high for 2 to 3 hours, until the chicken is cooked through and tender.
8. Shred the Chicken: Once cooked, remove the chicken breasts from the slow cooker and shred them with two forks.
9. Return to Slow Cooker: Return the shredded chicken to the slow cooker, mixing it well with the tomato and basil mixture.
10. Serve: Let it cook for an additional 10 minutes to allow the flavors to meld before serving.