Pat the chicken breast dry with paper towels and toss in a bowl with cornstarch, sea salt, and black pepper until every piece is lightly coated.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the skillet in a single layer and sear until the edges are golden and crispy, about 3 to 4 minutes per side.
Remove the chicken from the pan and set aside; add the broccoli florets and sliced red bell pepper to the same pan with a tablespoon of water to steam for 2 minutes.
In a small jar, whisk together the honey, tamari, sesame oil, minced garlic, and grated ginger until well combined.
Return the crispy chicken to the skillet and pour the honey-garlic sauce over the ingredients, tossing constantly for 1 minute until the sauce becomes thick and glossy.
Remove from heat and garnish with sesame seeds before serving hot.