Preheat BBQ to med-high heat.
Marinate chicken in olive oil and seasonings for 10 min. Add to grill once preheated and cook for 20 min until chicken is fully cooked.
Meanwhile, prepare other veggies and toppings. Brush corn with olive oil and grill for 8-10 min. Remove and let cool, then cut all the corn off the cob and place into a large bowl. Toss with sour ceam, feta, lime juice, chili powder, garlic, cilantro, salt and pepper.
Brush corn tortillas with olive oil then grill for 5-7 min until soft or crispy, depending on what you want (I would say 3-4 min for soft, 5-7 min for crispy).
Add chicken, bell peppers, Mexican street corn and red onion to tortillas in that order. Garnish with toppings of your choice and enjoy!