Place the raw chicken breasts flat at the bottom of a 6-quart or 8-quart slow cooker. Top the meat with your cubed potatoes, carrots, celery, and onions.
In a separate bowl, aggressively whisk together the condensed soups, chicken broth, smashed garlic, thyme, salt, and pepper until it forms a smooth paste.
Scrape the gravy mixture over the vegetables and smooth it out with a spoon to trap the moisture underneath.
Lock the lid. Cook on High for 4 hours or Low for 6–7 hours. Resist the urge to lift the lid!
Once the potatoes are fork-tender, remove the chicken and shred it into chunky pieces. Return the chicken to the pot, stir in the frozen peas and corn, and set the pot to "Warm" for 10 minutes.
While the stew rests, bake the refrigerated biscuits on a sheet pan according to the package instructions until they are tall and golden.
Ladle the hot, creamy filling into bowls and top each with a fresh, flaky biscuit.