Place chicken inside slow cooker insert. Take the Season All and rub it into each breast.
In a medium mixing bowl, stir together the 2 cans of Cream of Chicken, diced onion, diced celery, and diced carrots. Mix well and place on top of the chicken.
Cut the butter into pieces and place them on top.
Add enough water to the insert to cover the chicken and soup.
Cover and cook on high for 4 hours. Start making the dumplings when the 4 hours is up.
To Make the Dumplings
Combine the flour, baking powder, salt, sage, thyme, and both the 1 cup of milk and 2 tbsp. of milk in a medium mixing bowl.
Stir well until smooth. Let the dough rest for 5 minutes.
While the dough is resting, shred the chicken inside the slow cooker. Add the 2 cups of frozen peas.
Spoon enough dough into a regular spoon to fill it up. Drop by spoonfuls into the slow cooker.
Set the slow cooker to high again and continue to cook for another hour.
Notes
If you are super busy, 2 (7 and 1/2 oz.) cans of refrigerated biscuit dough (not the flaky kind) OR half a package of frozen flat dumplings instead of making the homemade dumplings above. After the 4 hours of cooking, place the biscuit dough or frozen dumplings inside the slow cooker. Then cook on high for an hour and a half. You can also use cream of celery soup instead of cream of chicken. We like to use a can of each. Recipe Source:Adapted from Gooseberry Patch's Big Book of Holiday Cooking