Whisk Dijon mustard, honey, and 1/2 tbsp olive oil. Toss chicken in half of the mixture and set aside the remainder.
Brush remaining olive oil on corn and zucchini. Season with Flavor God, salt and pepper.
Grill chicken, corn and zucchini at the same time. Brush chicken with remaining honey mustard when you flip it. Cook chicken until internal temperature reaches about 155 degrees, about 5 minutes per side depending on thickness (it will continue to cook and reach 165 degrees once you remove it from the grill).