Gather your crockpot, a sharp knife, a cutting board, and a wooden spoon to begin.
Dice the chicken breasts into 1-inch pieces, then set aside.
Slice the carrots into rounds and chop the onion into small pieces.
Mince the garlic cloves finely and set aside.
Layer the chopped onion, sliced carrots, and minced garlic at the bottom of the crockpot.
Spread the diced chicken evenly over the vegetables.
Pour in the chicken broth, making sure all ingredients are submerged.
Season with salt, black pepper, and dried thyme. Give everything a gentle stir with the wooden spoon to combine.
Cover the crockpot and set it to cook on low for about 6 hours, or high for 3–4 hours.
After cooking, check that the chicken is tender and easily shreds with a fork. If desired, remove the chicken, shred it, and stir it back into the broth for a thicker, more hearty soup.
Stir in chopped parsley and squeeze fresh lemon juice into the broth for brightness. Taste and adjust seasoning if needed.
Serve the hot, fragrant soup in bowls, garnished with extra parsley if you like. Enjoy the comforting, layered flavors and tender chicken in every spoonful.