Whisk the sour cream, mayonnaise, lemon zest, 1/2 teaspoon salt and a few grinds of pepper together in a large bowl.
Add the pasta to the boiling water and cook according to the package directions. Three minutes before the pasta is done, add the peas to the pot. Drain and rinse under cold water to cool. Add to the bowl with the dressing.
Add the red peppers, onion, and Parmesan to the bowl and toss to combine. Season with salt and pepper. The pasta salad is best if served right away.
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