In a small mixing bowl, whisk together the honey, sriracha, soy sauce, rice vinegar, sesame oil, minced garlic, and grated ginger until well combined.
Bring a small amount of water to a boil in a pot with a steamer basket; steam the broccoli florets for 3 to 4 minutes until tender-crisp, then remove and set aside.
Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the ground chicken to the skillet and cook, breaking it apart with a spatula, until browned and no longer pink.
Drain any excess liquid or fat from the pan.
Pour the prepared honey-sriracha sauce over the cooked chicken and stir to coat.
Whisk the cornstarch and water together in a small ramekin to create a slurry, then pour it into the skillet.
Simmer the chicken and sauce for 1 to 2 minutes until the glaze thickens and becomes glossy.
Fold the steamed broccoli into the chicken mixture and toss gently to coat everything in the sauce.
Remove from heat and garnish with sliced green onions, sesame seeds, and red pepper flakes before serving.