Spray a 4 quart slow cooker with nonstick cooking spray and lay 2 pounds boneless skinless chicken breast on the bottom of it.
In a small bowl combine 1 cup diced onion, 2 teaspoons minced garlic 1 teaspoon dried oregano , ½ teaspoon salt , ½ teaspoon ground black pepper , 3 tablespoons olive oil , 1 tablespoon red wine vinegar , 2 tablespoons lemon juice , and ⅓ cup water .
Pour the onion mixture over the chicken and place the lid on the slow cooker. Cook on LOW for 6 8 hours, or on HIGH for 4 6 hours.
Slow Cooker Greek Chicken Gyros with Tzatziki · Dinner Match Lab | Dinner Match Lab