Creating Mexican Street Corn Pasta Salad is simple when you follow these easy steps:

1. Cook the Pasta: In a large pot, bring salted water to a boil. Add the rotini pasta and cook according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
2. Prepare the Vegetables: In a large mixing bowl, combine the corn, red bell pepper, cherry tomatoes, red onion, and cilantro.
3. Make the Dressing: In a small bowl, whisk together the mayonnaise, sour cream, lime juice, chili powder, garlic powder, and salt and pepper until smooth.
4. Combine Ingredients: Add the cooked pasta to the bowl with the vegetables. Pour the dressing over the top and toss gently to combine all ingredients evenly.
5. Add Avocado and Cheese: Fold in the diced avocado and crumbled cotija cheese, being careful not to mash the avocado.
6. Chill: Cover the bowl and refrigerate for at least 30 minutes to allow the flavors to meld together.
7. Serve: Before serving, give the salad a gentle toss. Adjust seasoning if necessary.

These steps will guide you in creating a delicious and refreshing Mexican Street Corn Pasta Salad that is sure to impress!