Start by preparing your pasta. Place a large pot filled with lightly salted water on the stove and bring it to a rolling boil. Toss in your pasta, and cook it until it is al dente. Even if you prefer your pasta a bit softer, do not boil it further, as you will be baking it later.
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Now, place a skillet on the stove on medium heat, and toss in the ground meat and onion, with a slight drizzle of olive oil. Cook this until the onions are softened and caramelised, and the meat has taken on a rich brown colour. Make sure you stir it frequently, to help all the meat brown evenly.
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While the sauce is simmering, preheat the oven to 350 degrees F (175 degrees C), and prepare a 9x13 inch baking dish by greasing it lightly. Once the sauce is done and the pasta is boiled, you are ready to begin assembling the dish.
Start layering the ingredients in the baking dish in this particular order – first, layer in half the pasta, then all of the provolone cheese and all the sour cream, half the sauce, all the remaining pasta, all the mozzarella cheese, and all the remaining sauce. Top it all off with a generous sprinkling of half a cup of grated Parmesan cheese.
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