Pat the chicken breast dry and season both sides evenly with the sea salt, black pepper, and dried oregano.
Heat the extra virgin olive oil in a medium skillet over medium-high heat until shimmering.
Place the chicken in the skillet and cook for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
While the chicken is cooking, dice the cucumber and halve the cherry tomatoes.
In a medium mixing bowl, combine the cooked quinoa, diced cucumber, cherry tomatoes, chopped fresh parsley, lemon juice, and lemon zest.
Toss the quinoa salad thoroughly to ensure the lemon juice and zest are well distributed.
Remove the chicken from the pan and let it rest for 3 minutes before slicing it into thin strips.
Plate the quinoa salad and top with the sliced lemon-herb chicken for a clean, energizing lunch.