Preheat the oven to 400 degrees . In a 9-inch pie plate, spread the cream cheese in an even layer. Top with the marinara and half the mushrooms, peppers, olives and pepperoni. Sprinkle with the mozzarella. Top with the remaining mushrooms, peppers, olives and pepperoni.
Bake until the cheese melts, about 20 minutes. Sprinkle with the Italian seasoning. Serve with the breadsticks.