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Reduce the oven temperature to 350°.
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Lightly coat an 8x8 baking dish with nonstick cooking spray. (I use a 1.5 quart oval baking dish and it fits perfectly.)
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In a large bowl, combine shrimp, pasta, tomatoes, mozzarella cheese, red pepper flakes and alfredo sauce. (I use a big skillet for my sauce, so to save on dirty dishes, I add everything into the alfredo sauce skillet to combine.)
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Add pasta mixture to the baking dish and top with the parmesan cheese.
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Place into oven and bake until golden brown and cheese has melted, about 10 minutes.
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Garnish with parsley, if desired, and serve immediately.