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To make seasoning, mix all spices together. It will make about 1/2 cup. Set aside for later.
For the chicken, butterfly boneless, skinless chicken breasts into 2 even pieces each. Rub Greek seasoning evenly over chicken. Place in a shallow dish or large plastic bag with lemon juice, vinegar and olive oil. Let marinate for 30 minutes.
While chicken is marinating, prepare the Tzatziki Sauce. Grate the cucumber (you can peel it but I don't) onto a mesh strainer or paper towel and squeeze out as much liquid as you can. Add to a bowl with remaining ingredients. Stir to combine and refrigerate until ready to serve.
Preheat grill or grill pan to medium-high heat. Grill chicken for 8-10 minutes per side, or until a thermometer inserted in the center reads 165°F. Remove from grill and slice. Serve with Tzatziki Sauce.