Preheat oven to 400°F and line a large baking sheet with parchment paper.
Cut chicken breast into 1-inch cubes and season with sea salt and black pepper.
In a small bowl, whisk together orange juice, tamari, honey, sesame oil, minced ginger, minced garlic, and arrowroot powder until well combined.
Place chicken cubes, broccoli florets, and sliced bell peppers on the baking sheet.
Drizzle the orange sauce over the chicken and vegetables, tossing to ensure everything is thoroughly coated.
Bake for 18-20 minutes until the chicken is cooked through and the sauce has thickened into a glossy glaze.
Serve immediately, drizzling any remaining sauce from the pan over the top.