Heat oven to 500 degrees. Place flour in a zipper-lock bag and put beef cubes in bag. Close and shake to cover all beef cubes with flour. Place floured cubes in an oven-proof pan sprayed with cooking spray. Cook in 500 degree oven for about 20 minutes, until browned. Remove from oven and let cool on stovetop for 5 minutes. Gradually add broth to pan and stir to loosen browned bits. Add garlic and thyme. Cook covered on medium low heat for about 1 hour until beef is tender. Add carrots, cleaned mushrooms and cubed potatoes. Cook 20 minutes or until vegetables are tender. Add more broth if mixture becomes too dry.