Season the chicken breast evenly on both sides 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 sear for 6-7 minutes per side until golden brown and cooked through to an internal temperature of 165°F.
Remove the chicken from the pan and let it rest on a cutting board while you prepare the vegetables.
In the same skillet, add the minced garlic, diced zucchini, and red bell pepper, sautéing for 3-4 minutes until the vegetables are tender yet vibrant.
Stir the cooked quinoa, lemon juice, and lemon zest into the skillet with the vegetables, tossing for 1 minute to warm everything through.
Slice the rested chicken into strips and serve it over the quinoa and vegetable mixture, finishing with a sprinkle of crumbled feta cheese.