Rinse the brown basmati rice under cold water, then combine with 0.5 cup water in a small pot; bring to a boil, reduce to low, cover, and simmer for 25-30 minutes until tender.
While the rice cooks, dice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sauté for 5-7 minutes until golden brown and cooked through, then remove from the pan and set aside.
In the same skillet, add the broccoli florets and sliced red bell pepper, sautéing for 4-5 minutes until tender-crisp.
Stir in the minced garlic and grated ginger, cooking for 1 minute until fragrant.
Return the chicken to the skillet and pour in the tamari, tossing everything together to coat evenly.
Fluff the rice with a fork and divide it into bowls.
Top the rice with the chicken and vegetable mixture, garnishing with sliced green onions before serving.