Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Slice the zucchini into half-moons and the carrots into thin rounds, then toss them on the baking sheet with half of the olive oil, sea salt, and black pepper.
Roast the vegetables for 20-25 minutes, tossing halfway through, until they are tender and show golden caramelized edges.
While the vegetables roast, season the chicken breast evenly on both sides with the garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a stainless steel or cast iron skillet over medium-high heat and sear the chicken for 6-7 minutes per side until the internal temperature reaches 165°F.
Transfer the chicken to a cutting board and let it rest for 5 minutes before slicing it into thin, juice-retaining strips.
Prepare the bowl by layering the cooked jasmine rice at the bottom and topping it with the roasted zucchini, carrots, and sliced chicken.
Drizzle the fresh lemon juice over the entire bowl to brighten the flavors and serve immediately while warm.