Clean and slice the mushrooms into bite-sized pieces.
Mix perilla powder and soy milk to make the sauce.
Heat olive oil in a pan and sauté the garlic.
Add the mushrooms and stir-fry over high heat.
Add the cooked pasta and stir-fry with the mushrooms.
Pour in the perilla sauce and toss well over low heat.
Season with salt and pepper to taste, then serve.