Season the chicken breast evenly with sea salt, black pepper, and dried oregano.
Heat the extra virgin olive oil in a large skillet over medium-high heat.
Place the chicken in the skillet and cook for 5-7 minutes per side until golden brown and cooked through.
Remove the chicken from the pan, let it rest for 2 minutes, then slice it into bite-sized strips.
In the same skillet, add the diced zucchini and red bell pepper, sautéing for 3-4 minutes until tender-crisp.
Add the baby spinach to the skillet and stir for 1 minute until just wilted.
In a large serving bowl, combine the cooked quinoa, sautéed vegetables, and sliced chicken.
Drizzle the fresh lemon juice over the bowl and toss everything together to combine before serving.