Prepare marinade by stirring together first 10 ingredients (through salt & pepper). Let chicken soak in marinade for 2 hours
Cut chicken into pieces for kebabs
Toss bell peppers, zucchini and red onion in 2 tablespoon olive oi.
Soak wooden skewers in water for 30 minutes
Preheat grill to medium-high heat
Thread chicken pieces, peppers, zucchini and onions on the skewers
Cook skewers 7-9 minutes, or until chicken reaches 165 degrees F in the center. Turn after about 4 minutes
Prepare the tzatziki sauce by placing chopped cucumber in a strainer and sprinkle with salt (lightly). Let sit at room temperature for 30 minutes
Squeeze cucumbers in a paper towel to drain the excess water, and then place in food processor. Pulse to finely chop
Pour cucumbers into a large mixing bowl, add yogurt, garlic, lemon juice, olive oil, parsley and dill. Season with salt and pepper, to taste. Whisk all ingredients
Drizzle tzatziki sauce over kebabs and enjoy!