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Preheat oven to 375 degrees.
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In a small heavy saucepan over medium heat, bring cream, 1-1/2 cups cheese, pepper and salt just to a boil, stirring occasionally.
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Remove from heat.
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Meanwhile, cook pasta according to package directions until al dente; drain. Return pasta to pot, stir in prosciutto, peas, pimiento and cream sauce, mixing well and making sure pasta is well-coated. Transfer to a 2-quart shallow baking dish and bake 15 minutes.
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Stir pasta well to redistribute sauce, then sprinkle with additional Parmesan cheese (about 2 T.). Turn on broiler and broiler about 2-4 minutes, until top is lightly browned.