Heat a large skillet over high heat. Add the onion, mushrooms, and poblano pepper. Saute for 7-8 minutes, stirring frequently, until the onions start to brown and turn translucent. Add water 1 to 2 tablespoons at a time , as needed, to keep the vegetables from sticking to the pan.
Add the garlic and cook for another minute.
Add the nutritional yeast, black pepper, turmeric, chili powder and cauliflower, and cook for 1 minute.
Add the water to the pan, cover and cook for 3-4 minutes until the cauliflower is heated through.
Season with salt and cook for another minute.
To Serve, place two corn tortillas on a plate. Top with some of the scramble, and a spoonful of Ranchero Sauce over the top.
Serve with a spoonful of refried beans and garnish with cilantro and scallions