In a small bowl, whisk together the soy sauce, honey, rice vinegar, sesame oil, minced ginger, and minced garlic to create the sauce glaze.
In a large mixing bowl, toss the cubed chicken with cornstarch, salt, and pepper until each piece is lightly and evenly coated.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken to the skillet in a single layer, cooking for 6 to 8 minutes while turning occasionally until the exterior is golden brown and the internal temperature reaches 165°F (74°C).
Reduce the heat to medium and pour the sauce mixture over the chicken.
Toss the chicken continuously for 1 to 2 minutes until the sauce thickens into a glossy glaze that adheres to the meat.
Add the steamed broccoli florets to the skillet and toss briefly to incorporate and coat with the sauce.
Remove from heat and garnish with toasted sesame seeds and sliced green onions.
Serve immediately, optionally over cauliflower rice or brown rice.