1. Bring a large pot of lightly salted water to a boil. Cook pasta in boiling water for 8 to 10 minutes, or until al dente; drain. 2. Preheat oven to 375 degrees. Heat olive oil in large, heavy skillet over medium heat. Cook onion, garlic, ground beef, oregano and red pepper in oil until tender. 3. Add spaghetti sauce. Season with salt and pepper to taste. Let simmer for 5 to 10 minutes. 4. Mix ricotta cheese and sour cream together in separate bowl. Set aside. 5. Grease a 9x13 inch baking dish. In the prepared dish, layer 1/2 of the cooked pasta, provolone cheese, sour cream/ricotta mix, and a little less than 1/2 of the meat mixture. Top with layer of mozzarella cheese. Repeat, ending with remaining grated mozzarella. 6. Cover with foil and bake in the preheated oven for 25 minutes. Uncover and continue baking for 10 minutes, until cheese is slightly browned on top and pasta is bubbing. ---------------------------------------------------------------------------
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