Begin by placing the chicken breast in a shallow dish. Add a sprinkle of salt, pepper, fresh herbs, and minced garlic. Drizzle a bit of olive oil and lemon juice over it and let the chicken marinate for at least 20 minutes.
While the chicken marinates, prepare the quinoa according to package instructions, then let it cool slightly.
Wash the fresh spinach and slice the cherry tomatoes and cucumber into bite-sized pieces. Halve or dice the avocado just before serving to keep it fresh.
Preheat a grill pan or skillet over medium-high heat. Cook the marinated chicken for about 5-6 minutes per side or until the internal temperature reaches 165°F. Once done, let it rest for a few minutes before slicing it thinly.
In a bowl, combine the cooked quinoa, spinach, tomatoes, cucumber, and avocado. Drizzle with a lemon garlic dressing prepared by mixing lemon juice, minced garlic, olive oil, and chopped fresh herbs.
Top the bowl with the sliced chicken, season with extra herbs, salt, and pepper if desired, and enjoy your balanced, flavorful meal.