Place large plan on a the stove at high heat. Once the pan is very hot, place stew meat in pan making sure to sear each side very well (this locks in the juices).
Remove meat from pan and set aside. Turn heat to medium-high and add onions, carrots and celery. Cook, stirring frequently, until onions are translucent.
Add garlic and mushrooms to the pan and saute for 1-2 minutes. Make sure to keep stirring the veggies so the garlic doesn't burn.
Return the meat back to the pan and add tomatoes, onion soup mix, flavor god, garlic powder, salt and pepper.
Once combined add Worcester sauce, beef broth and water. Bring to a boil, then cover and reduce heat to low. Cook for two hours or until meat is tender.
Serve over mashed potatoes.