Prep Your Ingredients : Chop and prepare all vegetables (dice onion, chop bell pepper, julienne carrots, and cut broccoli into small florets) before cooking to make the process seamless. In a small bowl, whisk together the sauce ingredients: brown sugar, soy sauce, rice vinegar, sesame oil, ginger, and crushed red pepper flakes. Set aside.

Cook the Ground Beef : Heat the olive oil in a large skillet over medium-high heat. Add the ground beef and cook, breaking it up with a spoon, until browned and fully cooked (about 5–7 minutes). Drain any excess fat if needed. Add the diced onion and minced garlic to the beef. Cook for another 2–3 minutes, stirring frequently, until the onion becomes translucent and fragrant.

Add the Vegetables : Toss in the chopped red bell pepper, julienned carrots, and broccoli florets. Stir-fry the mixture for 5–7 minutes, or until the vegetables are tender-crisp. (For softer broccoli, you can add a splash of water to steam slightly while cooking.)

Add the Sauce : Pour the prepared sauce over the beef and vegetable mixture. Stir well to combine, ensuring everything is evenly coated. Cook for an additional 2–3 minutes, allowing the sauce to thicken slightly.

Garnish and Serve : Remove the skillet from heat and sprinkle sliced green onions and toasted sesame seeds on top. Serve hot over steamed rice, cauliflower rice, or noodles for a complete meal.