This is the BEST mushroom gravy! It's full of flavor, can be made gluten-free, and vegan! It's perfect for mashed potatoes, chicken, beef, or pork!
In a large skillet heat oil over medium high heat. Sautee mushrooms and onions until they are nicely browned (7 min). Add in garlic and stir until fragrant (about 30 sec)
Stir in the flour and cook for 1 minute. Whisk in the broth and scrape up all the browned bits from the bottom of the pan. Reduce to a simmer.