Boil the Corn: Bring a large pot of water to a boil. Add the corn and boil for 8-10 minutes until tender. (Keep the corn water for the pasta) Remove the corn, let cool, and slice the kernels off the cob. Set aside.
Cook the Macaroni: Salt the water from the corn and bring back to a boil. Add the elbow macaroni and cook according to the package instructions until al dente. Drain, then place the pasta in a large bowl.
Assemble the Salad: In the bowl with the cooked macaroni, combine the grilled corn kernels, grape tomatoes, red pepper, celery, black beans, red onion and jalapeño.
Prepare the Dressing: In a small bowl, whisk together mayonnaise, Greek yogurt, lime juice, Dijon mustard, cilantro, garlic, and chili powder.
Toss with Dressing: Pour the dressing over the pasta salad and gently toss to combine. Fold in the Cotija cheese and the diced avocados just before serving to avoid browning. Season with salt and pepper to taste.
Serve: Serve cold or at room temperature, garnished with extra cilantro and grated Cotija cheese if desired.
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