Place the beef and cornstarch in a bowl and toss together to coat.
Place the butter in a large lidded pot or Dutch oven and saute the onion on medium heat until softened.
Increase heat to medium-high and brown the beef on all sides.
Add the red wine, salt, black pepper, garlic powder, and thyme and cook for 2-3 minutes.
Add the carrots, potatoes, mushrooms, and bay leaf to the pot.
Pour in the beef broth and stir.
Simmer on medium-low for 30-45 minutes or until the beef and vegetables are tender.
If stew is too thick, you can thin it out with some extra water or broth.
Serve with warmed crusty bread and butter - enjoy!
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