Prep all vegetables and set aside. If using dried mushrooms, soak in hot water until rehydrated, then slice.
In a small bowl, mix the soy sauce, brown sugar, hoisin sauce, and the cornstarch slurry until well combined.
1 tablespoon soy sauce, ¾ tablespoon brown sugar, ½ tablespoon hoisin sauce, 1 tablespoon cold water + 1 tablespoon cornstarch
Heat a wok or large skillet over medium-high heat with a small amount of oil.
½ tbsp oil
Add firmer vegetables like carrots, green beans, and mushrooms first. Stir-fry for 2 to 3 minutes.
1 cup green beans, ¼ cup carrots, ½ cup shiitake mushrooms
Add softer vegetables like bell pepper, snap peas, baby corn, and water chestnuts. Stir-fry for another 2 to 3 minutes until just tender but still crisp.
¾ cup snap peas or snow peas, ½ cup red bell pepper, ¼ cup water chestnuts, 5 baby corn, ¾ cup broccoli or broccolini
Pour in the sauce and stir well to coat the vegetables. Cook for 2 more minutes until the sauce thickens and everything is heated through.
Remove from heat and serve immediately with rice, noodles, or protein of your choice.