Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Peel the sweet potato and cut into 1/2-inch cubes; slice the yellow bell pepper into 1-inch strips and the chicken breast into bite-sized chunks.
In a small mixing bowl, whisk together the olive oil, honey, tamari, and minced garlic cloves until well combined.
Place the chicken, sweet potato cubes, and yellow pepper strips onto the prepared sheet pan.
Drizzle the honey-garlic glaze over the ingredients and sprinkle with sea salt and black pepper.
Toss everything thoroughly with your hands or tongs to ensure an even coating, then spread into a single layer.
Roast in the oven for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the potatoes are fork-tender.
Turn the broiler on for the last 2 minutes if you prefer a more caramelized, golden finish on the chicken and peppers.