1. Preheat oven to 350°F.
  2. In a large skillet over medium-high heat, heat olive oil. Season chicken breasts with salt and pepper and add to the skillet. Cook chicken 2-3 minutes each side until golden brown.
  3. In a baking dish, pour half of the sauce and spread over the bottom of the dish. Place chicken into the sauce and cover with the remaining sauce.
  4. Layer cheese, parsley and pepperoni on top and bake until chicken is fully cooked, about 15 minutes.
  5. Serve.