In a small bowl, whisk together the Maggi Marketplace Premium Vegetable Base, soy sauce, sesame oil, brown sugar, garlic, ginger, lime juice, and red pepper flakes and set aside.
Heat the sesame oil in a large skillet or wok over medium-high heat. Add in the Portobello mushroom slices, onion, and red bell pepper and sauté for 5-7 minutes until the mushrooms are golden brown and slightly seared.
Add in the broccolini and bok choy and continue to cook for 2-3 minutes, until tender.
Add in the sauce and stir to coat. Cook for an additional 1-2 minutes until the sauce has thickened.
Serve over rice and top with sliced green onions and sesame seeds.