Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Toss the broccoli florets, sliced red bell pepper, and sliced carrots with half of the avocado oil, sea salt, and black pepper on the prepared baking sheet.
Roast the vegetables for 15-18 minutes until they are tender and show slight charred edges.
While the vegetables roast, prepare the teriyaki glaze by whisking together the tamari, maple syrup, grated fresh ginger, and minced garlic in a small bowl.
Season the chicken breast with the remaining sea salt and black pepper.
Heat the remaining avocado oil in a medium skillet over medium-high heat and sear the chicken for 5-6 minutes per side until golden brown and cooked through.
Reduce the skillet heat to low, pour the tamari mixture over the chicken, and simmer for 1-2 minutes until the sauce reduces into a thick, glossy glaze.
Slice the chicken into strips and serve immediately over the roasted vegetables, garnished with sesame seeds and thinly sliced green onions.