Prep the veggies: Dice the onion, carrots, celery, and potatoes.
Chop the pepper and slice the mushrooms. Mince the garlic.
Season the chicken: Pat the chicken dry, then season with 1/2 teaspoon salt, 1/4 teaspoon pepper, and the smoked paprika.
Optional sear for extra flavor: Heat olive oil in a skillet over medium-high. Sear chicken 2–3 minutes per side until lightly browned.
This step adds depth but isn’t required.
Layer the slow cooker: Add onion, carrots, celery, potatoes, bell pepper, mushrooms, garlic, diced tomatoes, beans, thyme, oregano, bay leaf, tomato paste, remaining salt and pepper. Pour in chicken broth and stir to combine.
Add the chicken: Place the seasoned (and optionally seared) chicken on top of the vegetables.
Cook low and slow: Cover and cook on Low for 6–7 hours or on High for 3–4 hours, until the chicken is tender and the potatoes are soft.
Shred the chicken: Remove the chicken to a plate. Shred with two forks into bite-size pieces, then return it to the slow cooker.
Brighten and adjust: Stir in lemon juice.
Taste and add more salt or pepper if needed. Remove the bay leaf.
Garnish and serve: Ladle into bowls and top with chopped parsley. Serve as-is or with crusty bread.