In a small pan, saute onions, peppers, and mushrooms for several minutes, stirring frequently, until they are reduced in volume and all the excess water is evaporated. If your mushrooms stick, add a splash of water to the pan.
Meanwhile, add the flour to the cup of water, broth, steak sauce and worcestershire sauce and stir well (I blended). Set aside.
Add the garlic to the sauteed vegetables and cook for 30 seconds.
Add the thyme, salt, and pepper (and other spices) to taste.
Give the flour/broth mixture a stir and slowly add it to the mushrooms. Stir until the gravy has thickened. If you prefer a thinner gravy, add a little more water and stir.