Slice the chicken breast into thin strips and chop the broccoli, bell pepper, and zucchini into small, uniform pieces to ensure they cook rapidly.
Heat the olive oil in a large skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken strips to the skillet and sauté for 3 to 4 minutes, stirring occasionally, until the edges are golden and the meat is nearly cooked through.
Add the broccoli, red bell pepper, and zucchini to the pan and continue to sauté for another 3 minutes until the vegetables are vibrant and crisp-tender.
Stir in the lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Toss everything together for 1 final minute to allow the flavors to meld and the sauce to glaze the chicken and vegetables, then serve immediately.