In a large skillet, heat the vegetable oil over medium-high heat. Add the ground beef and cook until browned, breaking it apart with a spatula, about 5-7 minutes. Drain excess fat if necessary.

Add the minced garlic and ginger to the skillet, cooking for an additional 1-2 minutes until fragrant.

Stir in the broccoli florets, soy sauce, brown sugar, rice vinegar, sesame oil, and red pepper flakes (if using). Mix well to combine.

Cover the skillet and cook for about 5-7 minutes, stirring occasionally, until the broccoli is tender but still bright green.

Remove from heat and garnish with sliced green onions. Serve over cooked rice or quinoa.