Season the chicken breast evenly on both sides with the sea salt, black pepper, and dried oregano.
Heat 0.5 tablespoon of extra virgin olive oil in a medium skillet over medium-high heat.
Add the chicken to the skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F and the outside is golden brown.
While the chicken is cooking, whisk together the remaining 0.5 tablespoon of olive oil, fresh lemon juice, and minced garlic in a small jar or bowl.
In a large serving bowl, combine the cooked quinoa, fresh spinach, diced cucumber, and halved cherry tomatoes.
Once the chicken is finished, let it rest for 3 minutes before slicing it into thin strips.
Place the sliced chicken on top of the quinoa and vegetable mixture.
Drizzle the lemon-garlic dressing over the entire bowl and toss gently to ensure everything is well-coated before serving.