Pat the chicken breast dry with a paper towel and season both sides evenly with sea salt, black pepper, garlic powder, and dried oregano.
Heat one tablespoon of extra virgin olive oil in a large skillet over medium-high heat.
Add the chicken breast to the hot skillet and sear for 6 to 7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Remove the chicken from the skillet and transfer to a plate to rest for 5 minutes.
In the same skillet, add the remaining tablespoon of olive oil along with the sliced zucchini, red bell peppers, and red onion.
Sauté the vegetables for 5 to 6 minutes over medium heat until they are tender-crisp and have developed slight caramelized edges.
Stir in the kalamata olives and fresh lemon juice, tossing the vegetables to ensure they are well coated and fragrant.
Slice the rested chicken breast into strips and serve it over the sautéed vegetable medley, finishing the dish with a sprinkle of crumbled feta cheese.