Make the Dressing: In a food processor, combine Greek yogurt, lime juice, cilantro, garlic, salt, and cayenne. Blend until smooth, about 30 seconds. Adjust seasonings if needed and refrigerate for 15 minutes.

Cook Pasta: Boil salted water in a large pot, add pasta, and cook per package instructions (8-10 minutes) until al dente. Drain, rinse with cold water, and let cool.

Prepare Veggies: Boil water in a medium pot, add corn, and cook for 1½ to 2 minutes. Drain. Halve tomatoes, dice onion, and chop cilantro.

Combine Ingredients: In a large bowl, mix cooled pasta, corn, tomatoes, onion, and cilantro. Pour in dressing and toss until coated.

Serve: Dish into bowls or a platter. Dice and sprinkle avocado on top. Optionally add cotija cheese. Serve immediately or chill.