In a small pot, bring 0.5 cup of water to a boil, stir in the dry couscous, cover, and remove from heat to let it steam for 5 minutes.
Season the chicken breast with sea salt, black pepper, and dried oregano on both sides.
Heat a grill pan or outdoor grill over medium-high heat and cook the chicken for 6-7 minutes per side until fully cooked.
While the chicken rests, dice the cucumber, halve the cherry tomatoes, finely mince the red onion, and chop the parsley.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, and minced garlic to create the dressing.
Fluff the couscous with a fork and combine it in a large bowl with the chopped vegetables and dressing.
Slice the grilled chicken into strips and serve it over the fluffy, herb-infused couscous salad.