The Best Gravy Ever

Description
Always check the ingredients to make sure the product is vegan.

Ingredients

 * 2 cups "chicken" broth (I like the Imagine Foods one that comes in the carton), boiling
 * 2 tbls vegetable oil
 * 3 tbls nutritional yeast
 * 1 vegetable boullon cube
 * 1 cup diced fresk mushrooms
 * onion salt to taste
 * Unbleached all-purpose flour

Directions
In a large saucepan, simmer all the ingredients except the flour for approximately 5 minutes. Slowly add the flour (tablespoon by tablespoon), whisking after each addition, until desired thickness is reached.