Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Place the broccoli florets and sliced red bell peppers on the sheet, tossing them with half of the avocado oil, sea salt, and black pepper.
Roast the vegetables for 15 to 18 minutes until they are tender and show slight charred edges.
While the vegetables are roasting, whisk together the tamari, honey, sesame oil, garlic powder, and ground ginger in a small bowl.
Season the chicken breast with a pinch of salt and pepper, then heat the remaining avocado oil in a skillet over medium-high heat.
Sear the chicken for 5 to 6 minutes per side until golden and cooked through, pouring the tamari mixture into the pan during the final 2 minutes.
Spoon the bubbling sauce over the chicken until it becomes thick and glossy, then slice the chicken and serve it alongside the roasted vegetables garnished with sesame seeds.