Season round steak with salt, black pepper and garlic powder. Brown steak in oil until very brown on both sides, be patient, this step is very important to the success of your gravy. When very brown, take steak out and put onion in to brown. Add steak back to the pot, add mushrooms and cover with water. Cook on medium heat until steak is very very tender, you may need to add water as you go. If you want to thicken the gravy, sprinkle some wondra at the end and boil.