1. Bring a large pot of lightly salted water to a boil. Cook spaghetti in the boiling water, stirring occasionally until cooked through but firm to the bite, about 12 minutes. Drain and transfer to a 7x11-inch baking dish. 2. Preheat oven to 350 degrees F (175 degrees C). 3. Stir spaghetti sauce into pasta until coated; add 2 to 3 layers of pepperoni, olives, and mushrooms on top of spaghetti. Cover the baking dish with aluminum foil. 4. Bake in the preheated oven until heated through, about 20 minutes; uncover and sprinkle with mozzarella cheese. Return to oven and continue baking until cheese is melted, about 10 minutes. ---------------------------------------------------------------------------
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