Sauté the mushrooms, bell pepper, onion, garlic, salt and a tablespoon of water in a pan over medium heat until soft, for approximately 3 to 5 minutes.
On the flatbread, add the marinara sauce, 1 tablespoon of nutritional yeast, sautéed vegetables, garlic powder, fresh basil, then more nutritional yeast on top.
Pop the flatbread in the oven for 8 to 10 minutes until toasty and warm. Before eating, drizzle with a balsamic glaze. Enjoy!