Cook the macaroni according to package instructions. Drain and set aside.
Preheat oven to 350F.
In a large mixing bowl, combine tuna (water drained), green peas, parmesan cheese, and alfredo sauce. Stir until well blended.
Add the macaroni. Toss until the macaroni are coated with the mixture.
Transfer everything to a baking dish. Top with sharp cheddar cheese.
Bake for 20 to 25 minutes.
Remove from the oven. Serve.
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