This Slow Cooker Creamy Tomato Basil Chicken is a rich, comforting dinner that takes almost no effort to prepare. Just add everything to the slow cooker and let it simmer into a creamy, herby tomato sauce while the chicken becomes perfectly tender. It’s ideal for busy days and delicious served over pasta, rice, or mashed potatoes.
1 can (14 oz / 398 ml) diced tomatoes with Italian herbs, with juice
1 cup marinara sauce
3 cloves garlic, finely minced
1 teaspoon salt
1 teaspoon Italian seasoning
1/2 teaspoon dried basil
1/4 teaspoon black pepper
1/2 cup heavy whipping cream
2 tablespoons cornstarch
4 boneless, skinless chicken breasts (about 2 lbs)
2 tablespoons fresh basil, finely chopped
Grated Parmesan cheese, for serving
In a 4–6 quart slow cooker, combine diced tomatoes, marinara sauce, garlic, salt, Italian seasoning, dried basil, and pepper. Stir well.
In a small bowl, whisk together heavy cream and cornstarch until smooth. Pour into the slow cooker and stir.
Place chicken breasts into the sauce and press down so they are mostly covered.
Cover and cook on low for 3–4 hours, until the chicken reaches an internal temperature of 165°F (74°C).
Stir in fresh basil. Taste and adjust seasoning if needed.
Serve with grated Parmesan on top.
Use chicken thighs for extra juiciness.
For a smoother sauce, swap diced tomatoes with extra tomato sauce.
Heavy cream or evaporated milk works best — regular milk may curdle.
Add red pepper flakes or cayenne for heat.
Stir in pesto if fresh basil isn’t available.
This makes lots of sauce — perfect for pasta night or meal prep.