1. Preheat oven to 350 degrees F (175 degrees C). Prepare a 9x13-inch baking dish with cooking spray. 2. 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 large bowl. 3. Mix eggs, Parmesan cheese, and butter with the spaghetti to coat pasta completely; spread into the prepared baking dish. Spread cottage cheese over the spaghetti to cover completely. Spread spaghetti sauce over the cottage cheese; top with a layer of mozzarella cheese. 4. Bake until hot in the center, about 30 minutes. ---------------------------------------------------------------------------
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