Once pressure completely releases, open lid and add the corn starch/water mixture. Gently stir the beef stew and close the lid for about 5 minutes for the gravy to thicken. Once stew thickens, enjoy!
Combine all ingredient except water & cornstarch in slow cooker (beef, olive oil, onion, garlic, carrots, potatoes, broth, tomato sauce, soy/Worcestershire sauce, herbs, sugar, salt, and pepper).
Cover and cook the stew on low for 7 hours or about 4 hours on high.
Whisk together the cornstarch and water until smooth. Stir into the beef stew, cover with the lid, and cook for about 5 minutes or until it slightly thickens the stew. Enjoy!