Prep the vegetables: Chop potatoes, carrots, celery, and onion into bite-size pieces. Mince the garlic.
Keep pieces consistent so they cook evenly.
Optional: Sauté for extra flavor: In a skillet, warm butter or oil over medium heat. Sauté onion, celery, and carrots for 3–4 minutes until slightly softened. Add garlic for 30 seconds.
This step boosts flavor but isn’t required.
Layer the slow cooker: Add potatoes first, then the sautéed (or raw) vegetables. Place the chicken on top. Season generously with salt and pepper.
Mix the broth base: In a bowl, whisk chicken broth with tomato paste, Worcestershire, thyme, rosemary, and a pinch of salt and pepper.
Pour over the chicken and vegetables. Tuck in the bay leaves.
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 and shred with two forks. Return it to the pot and stir.
Thicken if desired: For a thicker stew, whisk 2 tablespoons flour or cornstarch with 2–3 tablespoons cold water.
Stir into the stew. Cook on High for 15–20 minutes until slightly thickened.
Add peas and finish: Stir in frozen peas. Cook 5–10 minutes until bright and heated through.
Adjust seasoning with salt and pepper.
Serve: Ladle into bowls and garnish with chopped parsley. Add a squeeze of lemon if you like a fresh pop at the end.