Rinse the quinoa under cold water and combine with 0.5 cup of water in a small saucepan.
Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the water is absorbed and the quinoa is fluffy.
While quinoa cooks, season the chicken breast with half of the sea salt, black pepper, and garlic powder.
Heat the olive oil in a skillet over medium-high heat and cook the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Remove the chicken from the pan to rest, then add the chopped broccoli and bell pepper to the same skillet with a splash of water.
Sauté the vegetables for 4-5 minutes until tender-crisp, seasoning with the remaining salt, pepper, and garlic powder.
Slice the chicken into strips and assemble the bowl by layering the quinoa, sautéed vegetables, and chicken.
Finish by drizzling fresh lemon juice over the entire bowl for a bright, clean flavor.