Cut the chicken into 8 pieces and pound all the four pieces until they are thin. Season chicken with salt and pepper on both sides. Put 1 ½ tablespoon of the spinach mixture in the middle of the chicken and roll it up. Secure together using toothpicks, if needed. Repeat the process for all the chicken pieces.
Put ½ cup of the tomato sauce on the bottom of a greased baking dish and set it aside.
In a skillet, sauté the chicken breast in oil until golden brown. Then transfer the chicken to the baking dish.
Cover evenly with remaining tomato sauce and bake for 25 to 30 minutes until the chicken gets to an internal temperature of 165°F degrees.
Remove chicken from the oven, top with mozzarella cheese and bake for more 2 minutes. Before serving top with fresh parsley.
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