Using a strainer or colander, rinse the rice under cold, running water, then cook according to package instructions. Once done, remove rice from the heat and let it stand, still covered, for 5 minutes.
Meanwhile, wash and dry the fresh produce.
Trim and slice zucchini crosswise into 1/2-inch thick rounds. Trim, seed, and halve mini bell peppers (if using regular peppers, cut into bite-sized pieces). Place both in a medium bowl, drizzle with oil, then season with salt and pepper. Toss to combine and set aside.
Shave parsley leaves off the stems; discard stems and mince the leaves. Cut lemon into wedges. Set both aside for serving.
Preheat a skillet over medium-high heat. Once hot, add oil and swirl to coat the bottom. Add chicken, then cover and cook until seared on one side, 4-6 minutes. Flip and cook, still covered, an additional 5-10 minutes, until internal product temperature reaches 165°F on a meat thermometer. Remove to a plate and loosely cover with aluminum foil to keep warm.
Meanwhile, preheat a grill pan over medium-high heat. Once hot, add veggies and grill, turning occasionally, until charred and fork-tender, 5-10 minutes. Return to the bowl and cover to keep warm.
Thinly slice chicken.
To serve, divide rice pilaf, grilled veggies, and chicken between plates. Sprinkle with parsley and squeeze lemon over top. Enjoy!