Bring 0.25 cup water to a boil in a small saucepan, stir in the dry couscous, cover, and remove from heat to steam for 5 minutes.
Slice the chicken breast into bite-sized pieces and season with 0.125 tsp sea salt, 0.125 tsp black pepper, and the dried oregano.
Heat 1 tsp of olive oil in a skillet over medium-high heat and sauté the chicken until golden brown and cooked through.
In a small bowl, whisk together the remaining 1 tsp olive oil, lemon juice, minced garlic, and the remaining salt and pepper to create the dressing.
Fluff the steamed couscous with a fork and transfer it to a large serving bowl.
Add the sautéed chicken, diced cucumber, halved cherry tomatoes, and chopped fresh parsley to the couscous.
Drizzle the lemon dressing over the bowl and toss well to combine all the flavors before serving.