Rinse the quinoa under cold water and place in a small pot with 0.5 cup of water, bringing it to a boil before simmering for 15 minutes until fluffy.
Season the chicken breast evenly with the sea salt, black pepper, and dried oregano.
Heat a non-stick skillet over medium heat and sauté the chicken for 6-7 minutes per side until fully cooked, then set aside to rest before slicing into bite-sized pieces.
While the chicken and quinoa cool slightly, dice the cucumber, halve the cherry tomatoes, and finely mince the red onion and fresh parsley.
In a small jar or bowl, whisk together the extra virgin olive oil, lemon juice, and minced garlic to create the vinaigrette.
Combine the cooked quinoa, sliced chicken, and chopped vegetables in a large bowl, then pour the dressing over the top and toss well to combine.