Prepare all ingredients by washing and cutting as instructed.
Place the diced chicken in the crockpot.
Add the chopped carrots and celery.
Stir in the diced onion and minced garlic.
Pour the broth over the ingredients in the crockpot.
Add thyme, salt, and pepper to taste.
Mix everything gently to combine.
Cover the crockpot with the lid.
Set to low for 6-8 hours or high for 3-4 hours.
About 30 minutes before serving, stir in the frozen peas.