Prepare the Sauce: In a small bowl, mix together the honey, soy sauce, and red pepper flakes (if using). Set aside.
Preheat the Heat: In a large skillet or wok, heat the vegetable oil over medium-high heat.
Cook the Brussels Sprouts: Add the halved Brussels sprouts to the skillet and stir-fry for about 5 minutes or until they begin to brown slightly.
Add Veggies: Incorporate the sliced red bell pepper into the skillet, cooking for an additional 3-4 minutes until the pepper is tender.
Flavor It Up: Stir in the minced garlic and grated ginger, continuing to stir-fry for about 1-2 minutes until fragrant.
Add the Sauce: Pour the honey-soy sauce mixture over the vegetables, and toss to coat everything evenly. Cook for another 2-3 minutes, allowing the sauce to caramelize slightly.
Season: Taste and season with salt and pepper as needed.
Serve: Remove from heat and transfer the stir fry to a serving dish. Garnish with sesame seeds and chopped green onions.