Pat the chicken breast dry with paper towels and toss in a bowl with cornstarch, sea salt, and black pepper until evenly coated.
Heat the olive oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken in a single layer and sear until golden and crispy on all sides, approximately 5 to 6 minutes.
Remove the chicken from the pan and set aside on a plate.
Add the broccoli florets and sliced red bell pepper to the same pan with one tablespoon of water.
Cover the pan with a lid for 2 to 3 minutes to steam-sauté the vegetables until they are tender-crisp and vibrant.
In a small bowl, whisk together the honey, tamari, minced garlic, and grated ginger to create the sauce.
Return the crispy chicken to the pan and pour the honey-garlic sauce over the mixture.
Toss everything together for 1 to 2 minutes until the sauce bubbles and thickens into a glossy glaze.
Serve immediately, garnished with toasted sesame seeds and thinly sliced green onions.