While grill is pre-heating, season chicken breasts with cumin, smoked paprika, oregano, salt and pepper. Rub chicken well to make sure spices are evenly coated.
Spray the grill with non-stick grilling spray then add the chicken breasts and corn.
Cook chicken 3-5 minutes on one side until nicely browned. Flip to other side and cook until browned or internal cooking temperature reaches 160 degrees fahrenheit.
While chicken is cooking, rotate corn every 2 minutes until all sides have a bit of char an are bright yellow/white.
Remove chicken and corn from the grill and set aside. Let chicken rest at least 5 minutes before slicing.
In a large mixing bowl, combine cooked penne with tomatoes, scallions, cilatro, olive oil and red wine vinegar. Dice chicken and add to the bowl. Carefully slice corn kernels off the cob right into the bowl (to avoid a mess!)
Toss well and check for seasoning. Add salt and pepper to taste.
Dish can be served warm, room temperature or cold. Tastes even better the next day - great for making ahead.