Butterfly chicken breast and drizzle with olive oil.
Sprinkle chicken breast with Hidden Valley Seasoning and Dressing Mix and set aside.
In a saute' pan cook spinach until spinach has started to cook down. Remove spinach from heat and add to a medium bowl with Parmesan cheese, half of the mozzarella cheese, bread crumbs and beaten egg and olives. Mix all ingredients until well incorporated.
Place a large spoonful of spinach mixture in the middle of each chicken breast and fold over, covering the spinach mixture completely.
Sprinkle with remaining cheese and place on baking sheet and bake on 350 degrees for 20-25 minutes or until thermometer reaches 165 degrees when chicken is tested.