Easy Chicken Gyros {New and Improved}

Chicken Marinade:

• ½ ½ cup PLAIN yogurt
• ¼ ¼ cup fresh lemon juice
• 2 2 tablespoons red wine vinegar
• 2 2 tablespoons olive oil
• 1 1 tablespoons dried oregano
• 1 1 tablespoon finely minced garlic (or 1 1/2 teaspoons garlic powder)
• 1 1 teaspoon coarse kosher salt
• ¼ ¼ teaspoon coarsely ground black pepper
• 1 ½ 1 ½ pounds boneless, skinless chicken breasts or thighs

Tzatziki Sauce:

• 1 1 medium English/seedless cucumber
• 1 ½ 1 ½ cups plain Greek yogurt (extra thick - see note)
• 1 1 tablespoons fresh lemon juice
• 1 1 tablespoon olive oil
• 1 to 2 1 to 2 teaspoons finely minced garlic (or 1/2 teaspoon garlic powder)
• pinch salt and pepper

Flatbread + Toppings:

• 6 6 pieces flatbread or pita bread
• Crumbled feta cheese, chopped tomatoes, lettuce, olives, red onions, etc.