Preheat oven to 375 degrees F. Prepare 13 x 9 or 3 quart baking dish by spraying it with cooking spray.
Cook pasta shells according to package directions.
In a large skillet, heat olive oil over medium heat; saute onions, green pepper, and mushrooms until soft for 5-7 minutes. Set aside.
In the same skillet, cook the ground turkey. Add sauce and spices, salt and pepper; cook for another minute. Add sliced olives, beans, and pico de gallo; stir.
In a large bowl, mix together the onion mixture with the ground turkey mixture with the cooked, drained pasta.
Add the mixture to the 9×13 pan; place the fresh mozzarella cheese slices on top.
Bake uncovered for 30 minutes. Serve with cilantro, avocado, sour cream and hot sauce.