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Preheat oven to 350ºF. Lightly spray a 9×13-inch pan with cooking spray. Set aside.
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Cook spaghetti according to package directions. Drain. Whisk together eggs, parmesan cheese, and melted butter. Toss with pasta. Place in prepared pan.
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Combine Italian seasoning, garlic, cream cheese, and sour cream. Spread over pasta.
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Combined cooked sausage or hamburger and spaghetti sauce. Spread over cream cheese mixture. Top with 2 cups shredded mozzarella cheese.
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Bake for 45 minutes, or until cheese is melted and bubbly.