Preheat oven to 350℉.
Cook pasta according to package and drain.
In a large skillet, heat olive oil over medium heat and sauté ground turkey, onion, and garlic until meat is cooked. Drain.
Spray a 9x13-inch baking pan with cooking spray.
In a medium bowl, mix cooked pasta, meat mixture, sauce, 1 cup of cheese, 16 pepperonis, and Italian seasoning. Mix well.
Spread the pasta mixture evenly in the pan. Top with remaining cheese, pepperoni, and olives.
Cover with foil and bake for 20 minutes.
Remove foil and bake for an additional 10 minutes until heated through.
Cut into 12 equal servings.