With a knife, carefully cut a slit in the side of the chicken making sure to not cut all the way through.
3. Step
Season the chicken breasts with olive oil, pepper, and salt.
4. Step
Stuff each chicken breast with a clove of garlic, half of the mozzarella, half of the sun-dried tomatoes, and 1 ounce (30g) of baby spinach. (You may use toothpicks to close the ingredients inside the chicken breasts if desired, just remember to remove them!)
5. Step
In a cast-iron skillet, sear chicken on medium-high heat until all sides are browned.
6. Step
Continue baking in oven for 15-20 minutes, or until internal temperature of the chicken reaches 165˚F (75˚C). Set aside.
7. Step
Heat marinara and spinach in the cast-iron skillet on medium-high heat until spinach is wilted.
8. Step
Serve chicken on top of whole wheat pasta and spinach marinara sauce.
