Prep the Ingredients: Start by cleaning and cutting your veggies. Quarter the red potatoes, trim and peel the carrots, and clean the green beans.
Layer the Chicken: Place the chicken breast fillets at the bottom of the slow cooker.
Add the Vegetables: Layer the quartered potatoes, carrots, and green beans on top of the chicken.
Mix the Sauce: In a bowl, combine the melted butter, freshly squeezed lemon juice, dried oregano, onion powder, crushed garlic, salt, and pepper. Stir well.
Pour Over Chicken and Veggies: Drizzle the sauce over the chicken and veggies, making sure they're evenly coated.
Cook: Cover the slow cooker and cook on low for 6-8 hours or high for 4-5 hours, until the chicken is tender and cooked through.
Serve and Enjoy: Once done, serve the dish warm. Enjoy your flavorful one-pot meal!