01 - Place the chicken breasts in the bottom of a 6-quart slow cooker in a single layer.
02 - Scatter the halved baby potatoes and sliced onion evenly around and over the chicken.
03 - In a small bowl, combine the olive oil, minced garlic, dried thyme, dried rosemary, paprika, kosher salt, and black pepper. Stir to form a paste.
04 - Drizzle the herb and oil mixture evenly over the chicken and potatoes, coating as much of the surface as possible.
05 - Pour the chicken broth into the slow cooker along the edge, being careful not to wash the seasoning off the chicken and potatoes.
06 - Cover the slow cooker and cook on LOW for 5 hours.
07 - After 5 hours, arrange the trimmed green beans on top of the chicken and potatoes. Cover and continue cooking on LOW for 1 more hour, until the green beans are tender and the chicken reaches an internal temperature of 165°F.
08 - Serve hot, garnished with fresh chopped parsley and lemon wedges on the side if desired.