Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
In a small mixing bowl, whisk together the honey, tamari, rice vinegar, toasted sesame oil, minced garlic, grated ginger, and red pepper flakes.
Cut the chicken breast and the tempeh into uniform 1-inch cubes to ensure even cooking throughout the bake.
Place the chicken cubes, tempeh cubes, broccoli florets, and sliced red bell peppers onto the prepared baking sheet.
Drizzle the extra virgin olive oil over the chicken and vegetables, tossing them with your hands or a spatula to coat thoroughly.
Pour exactly half of the honey-garlic sauce over the mixture on the tray and toss again until everything is well-glazed.
Spread the ingredients out into a single layer, making sure there is space between the pieces so they roast rather than steam.
Bake for 18 to 20 minutes, or until the chicken reaches an internal temperature of 165°F and the tempeh edges are golden and crispy.
Remove the tray from the oven and immediately drizzle the remaining sauce over the hot ingredients before serving.