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2 pounds ground beef
1/4 cup chopped onion
2 (26.5 ounce) cans meatless spaghetti sauce
1 (16 ounce) container sour cream
2 cups shredded mozzarella cheese, divided
1/2 cup Parmesan cheese
salt and black pepper to taste
Preheat oven to 350 degrees F (175 degrees C). Grease a deep 9×13 inch baking dish. Bring a large pot of salted water to a boil over high heat. Stir in the spaghetti. Boil the pasta until cooked through but still firm to the bite, 8 to 10 minutes. Drain well. Brown ground beef and onion in a large skillet over high heat; drain fat. Stir in the spaghetti sauce, sour cream, and 1 cup of the mozzarella. Mix in the cooked pasta. Transfer pasta mixture to prepared baking dish. Top with remaining 1 cup of mozzarella and the Parmesan cheese. Cover pan with aluminum foil. Bake in preheated oven until hot and bubbly, about 30 minutes.