Pat the chicken breast dry with a paper towel and cut into 1-inch pieces.
Place the chicken in a bowl and toss with cornstarch, sea salt, and black pepper until each piece is lightly coated.
In a small glass jar or bowl, whisk together the fresh orange juice, coconut aminos, honey, grated ginger, and minced garlic.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the chicken to the pan in a single layer and cook for 5-6 minutes, turning occasionally, until golden brown and crispy on the outside.
Remove the chicken from the pan and set aside; add the broccoli florets and sliced red bell pepper to the same pan.
Sauté the vegetables for 3-4 minutes, adding a splash of water if needed to steam them slightly until they are bright green and tender.
Return the chicken to the pan and pour the orange sauce over the top, stirring for 1-2 minutes until the glaze bubbles and thickens.
Serve immediately, garnished with a sprinkle of sesame seeds for extra crunch.