Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into uniform 1/2-inch cubes, then place them on the prepared baking sheet.
Slice the chicken breast into bite-sized chunks and add them to the pan along with the trimmed green beans.
In a small glass jar or bowl, whisk together the olive oil, sesame oil, honey, tamari, minced garlic, sea salt, and black pepper.
Drizzle the honey-garlic sauce over the chicken and vegetables, tossing with your hands or tongs to ensure every piece is well-coated.
Spread the ingredients out into a single, even layer so they roast properly rather than steaming.
Bake for 20 to 25 minutes, tossing halfway through, until the chicken is cooked to an internal temperature of 165°F and the sweet potatoes are tender and browned.