This Mexican Pasta Salad Recipe pulls together black beans, sweet corn, and crumbled cotija cheese in a lime-spiked dressing built from mayonnaise, sour cream, chili powder, cumin, and smoked paprika.
Cook the rotini in a large pot of generously salted boiling water until al dente, about 9-11 minutes.
Drain the pasta and rinse immediately under cold running water for about 1 minute. Spread on a sheet pan or refrigerate to cool completely.
Drain and rinse the black beans, dice the bell pepper and red onion, halve the cherry tomatoes, and chop the cilantro.
In a small bowl, whisk together the mayonnaise and sour cream until smooth, then add the lime juice, garlic, chili powder, cumin, smoked paprika, salt, and pepper.
In a large bowl, combine the cooled pasta, black beans, corn, tomatoes, bell pepper, and red onion. Pour the dressing over and fold gently until evenly coated.
Cover the bowl and refrigerate for at least 30 minutes to allow the flavors to meld.
Just before serving, dice the avocado and fold it into the salad along with the crumbled cotija cheese. Sprinkle with reserved cilantro and serve.
Notes
Salt the pasta water generously. Under-seasoned pasta stays bland no matter how flavorful the dressing is.
Don't skip the cold rinse. It stops the cooking process and washes off surface starch that would otherwise make the salad gummy.
Add avocado last. Mixing it in early causes it to break down and turn the whole salad brown-tinged within a couple of hours.
Char the corn in a dry skillet for a few minutes to add a smoky sweetness.
Soak the red onion in cold water for 10 minutes to mellow the sharp bite if desired.
Double the dressing if you like your pasta salad extra creamy, as rotini tends to absorb dressing as it sits.
Use fresh lime juice, not bottled, since bottled juice tends to taste flat and slightly metallic in a cold dressing.
Cut vegetables into similar-sized pieces to ensure a consistent ratio of pasta to vegetables in every bite.
Taste the dressing before adding it to the pasta. It should taste slightly over-seasoned on its own, since the pasta will mellow the flavor once everything is mixed.
Keep the cheese and avocado separate from the rest of the leftovers if prepping more than a day in advance, and fold them in fresh each time you serve.