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1
Bring a large pot of lightly salted water to a boil.
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2
Cook pasta in boiling water for 8 to 10 minutes, or until al dente; drain.
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3
Preheat oven to 375 degrees.
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4
Heat olive oil in large, heavy skillet over medium heat.
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5
Cook onion, garlic, ground beef, oregano and red pepper in oil until tender.
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6
Add spaghetti sauce.
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7
Season with salt and pepper to taste.
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8
Let simmer for 5 to 10 minutes.
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9
Mix ricotta cheese and sour cream together in separate bowl.
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10
Set aside.
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11
Grease a 9x13 inch baking dish.
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12
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.
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13
Top with layer of mozzarella cheese.
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14
Repeat, ending with remaining grated mozzarella.
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15
Cover with foil and bake in the preheated oven for 25 minutes.
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16
Uncover and continue baking for 10 minutes, until cheese is slightly browned on top and pasta is bubbing.
