Season the chicken breast evenly on both sides with the garlic powder, dried oregano, sea salt, and black pepper.
Heat 1 teaspoon of olive oil in a medium skillet over medium-high heat and sear the chicken until golden brown and cooked through, approximately 5 to 7 minutes per side.
While the chicken is cooking, place the chopped kale in a large mixing bowl and massage it with the remaining 1 teaspoon of olive oil and half of the lemon juice until the leaves are softened and vibrant.
Remove the chicken from the pan, let it rest for 2 minutes, then slice it into thin strips.
Add the cooked quinoa, diced cucumber, and halved cherry tomatoes to the bowl with the kale, tossing gently to combine.
Arrange the sliced chicken on top of the quinoa and vegetable mixture.
Garnish with crumbled feta cheese and drizzle the remaining lemon juice over the entire bowl before serving.