Cook pasta in boiling salted water until al dente. Drain, rinse with cold water, and chill in the fridge.
Heat a cast-iron skillet over medium-high heat. Add 1 tbsp oil and swirl.
Add corn kernels to the hot skillet and cook for 5-6 minutes until charred and fragrant.
Remove corn and let it cool to room temperature.
Whisk together yogurt, mayonnaise, lime zest, lime juice, chili powder, salt, and pepper for the dressing.
Combine cooled pasta, charred corn, cilantro, avocado, red onion, and Cotija cheese in a large bowl. Pour dressing over and gently stir.
Garnish with extra Cotija cheese, cilantro, and chili powder before serving.