Dice the chicken breast into 2-centimeter cubes and season with sea salt and black pepper.
Chop the red bell pepper, zucchini, and red onion into bite-sized pieces.
Heat the olive oil in a large skillet over medium-high heat until shimmering.
Add the chicken to the skillet and sear for 5-6 minutes until golden brown and cooked through.
Remove the chicken from the pan and set aside on a plate.
In the same skillet, add the red onion, bell pepper, and zucchini, sautéing for 4-5 minutes until tender-crisp.
Mince the garlic and grate the fresh ginger, then add them to the vegetables for 1 minute until fragrant.
Return the chicken to the skillet and pour in the tamari, tossing everything together for 1-2 minutes to glaze.
Serve immediately in a bowl, ensuring a colorful mix of vegetables and protein.