Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the garlic and ginger, sautéing for about 30 seconds until fragrant.
Add the Portabella mushrooms and cook for 3-4 minutes until they soften and release moisture.
Toss in the broccoli, bell pepper, carrot, and snow peas. Stir-fry for 4-5 minutes until the veggies are tender-crisp.
In a small bowl, whisk together the soy sauce, rice vinegar, and honey. Pour the sauce over the veggies and mushrooms. Stir well to coat.
Cook for an additional 2-3 minutes, letting the sauce thicken slightly.
Sprinkle with sesame seeds and garnish with fresh cilantro. Serve hot with rice or noodles.