Prepare all vegetables by slicing carrots thinly on a bias, julienning bell peppers, cutting broccoli into uniform small florets, and slicing mushrooms. Keep everything ready before cooking.
Mix soy sauce, mirin, honey, minced garlic, and minced ginger in a small bowl to create the teriyaki sauce. Set aside.
Heat a large wok or wide skillet over medium-high heat until hot, then add a tablespoon of sesame or vegetable oil. Swirl to coat the pan.
Add the sliced carrots and broccoli florets to the hot pan. Stir constantly and cook for about 2-3 minutes until they start to turn vibrant and slightly tender with a slight char.
Next, add the julienned bell peppers and sliced mushrooms. Continue stir-frying for another 2-3 minutes until the vegetables are colorful, slightly blistered, and fragrant with garlic and ginger aroma.
Pour the prepared teriyaki sauce over the vegetables. Let it bubble and cook for 1-2 minutes until the sauce thickens into a glossy glaze that coats everything evenly.
Toss the vegetables gently to ensure they are evenly glazed. The sauce should cling to the veggies, giving them a shiny, vibrant appearance.
Remove from heat and sprinkle with toasted sesame seeds and sliced green onions for added crunch and fresh flavor.
Serve immediately while the vegetables are crisp-tender and glistening with the savory sauce. Enjoy the beautiful colors and flavors!