Preheat your oven to 400°F (200°C).
Season the chicken breast with salt, pepper, and a generous sprinkle of mixed fresh herbs.
Place the chicken on a baking tray lined with parchment paper and roast for 20-25 minutes, or until the internal temperature reaches 165°F (74°C).
While the chicken is roasting, prepare the quinoa following package instructions, then fluff with a fork.
Chop the cherry tomatoes in halves, dice the cucumber, and slice the bell pepper into strips.
In a bowl, combine the cooked quinoa and fresh vegetables. Drizzle with olive oil and lemon juice, then toss to mix evenly.
Once the chicken is cooked, let it rest for a few minutes before slicing it into strips.
Assemble the bowl by layering the quinoa and vegetable mixture with the roasted chicken on top.
Finish with an additional sprinkle of fresh herbs, if desired, and serve warm.