Season the chicken breast evenly with the sea salt and black pepper.
Heat the extra virgin olive oil in a medium skillet over medium-high heat.
Place the chicken in the skillet and sear for 5 to 7 minutes per side until golden brown and cooked through.
While the chicken is cooking, mince the garlic clove and finely chop the fresh parsley.
In a large mixing bowl, whisk together the lemon juice, minced garlic, and chopped parsley to create the dressing.
Dice the cucumber and halve the cherry tomatoes.
Add the cooked quinoa, baby spinach, cucumber, and tomatoes to the mixing bowl with the dressing and toss well.
Once the chicken is done, let it rest for 2 minutes before slicing into thin strips.
Place the sliced chicken on top of the quinoa salad and serve immediately.