Begin by putting rice noodles in boiling water. Cooking times will vary depending on the thickness of the noodle.
Slice mushrooms, heat olive oil and sauté until soft. Add crushed or chopped garlic; sauté 1 more minute. Set aside.
Dissolve miso into water, mix. Add nutritional yeast to miso. Add mushrooms to miso sauce. Add a dash or two of cayenne, salt, and black pepper to taste.
By this time, your noodles should be ready. Drain, and mix sauce into noodles, and enjoy!