Make marinade:
Whisk together canola oil, lime juice, chili powder, cumin, garlic powder, salt, and pepper in a bowl. Submerge chicken in the mixture and let it sit for at least 15 minutes.Prepare street corn:
In a separate bowl, stir together cooked corn, mayonnaise, lime juice, chili powder, cilantro, jalapeño, green onions, and garlic salt.Grill chicken:
Place the marinated chicken on a grill preheated to medium-high. Cook for about 5–7 minutes per side until the internal temperature hits 165°F (75°C).Assemble tacos:
Heat tortillas on the grill for roughly 30 seconds per side. Cut the cooked chicken into strips. Fill each tortilla with the chicken, street corn mixture, sliced avocado, cotija cheese, cilantro, sour cream, and taco sauce to taste.