Place the chicken thighs in the slow cooker along with the olive oil.
Add the onions, carrots, potatoes, and seasonings to the slow cooker.
Add the chicken stock.
Cover and cook for 4 hours on high, or 6-8 hours on low.
When the cooking time is up, place the cornstarch in a small cup and whisk it with a half cup of water. Add to the slow cooker and allow it to cook for about 20 more minutes so that the stew thickens.
Enjoy! Serve with crackers or bread if you like.
Notes
Store leftover stew in an airtight container in the refrigerator. It should stay fresh for about 4 days.