Arrange chicken and vegetables:
Set the chicken in the center of the slow cooker. Arrange the green beans on one side and pile the potatoes high on the other side.Whisk lemon-herb mixture:
In a medium bowl, combine the lemon juice, olive oil, oregano, salt, pepper, onion powder, and minced garlic with a whisk.Drizzle lemon mixture:
Drizzle the lemon mixture evenly over the chicken, green beans, and potatoes.Cook covered on high or low:
Cover and cook on HIGH for 4 hours or LOW for 7 hours. Do not lift the lid during cooking.Avoid bottled lemon juice:
Note: Avoid using bottled lemon juice; the dish will not come out correctly.