Season the beef cubes with salt and pepper. Heat oil in a large skillet over medium-high heat. Sear the beef until browned on all sides, about 3-4 minutes per side. Remove from skillet.

In the same skillet, sauté onions and mushrooms in the drippings until golden brown, about 5-7 minutes. Add garlic during the last minute.

Sprinkle flour over veggies and stir for one minute. Gradually whisk in beef broth and Worcestershire sauce. Bring to a simmer.

Return the beef to the skillet, cover, and simmer on low heat for at least one hour until tender.

Serve hot over mashed potatoes or rice.