Preheat your oven to 400 degrees Fahrenheit and line a small baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized 1-inch cubes to ensure even cooking and maximum surface area for the herbs.
In a medium mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, rosemary, thyme, garlic powder, sea salt, and black pepper.
Add the chicken cubes to the bowl and toss thoroughly until every piece is well-coated in the herb marinade.
Spread the chicken bites in a single layer on the prepared baking sheet, ensuring they are not touching so they roast rather than steam.
Roast the chicken in the oven for 15 to 18 minutes, or until the internal temperature reaches 165 degrees Fahrenheit and the edges are slightly golden.
While the chicken is roasting, place the broccoli florets in a steamer basket over boiling water and steam for 4 to 5 minutes until vibrant green and crisp-tender.
Remove the chicken from the oven and let it rest for 2 minutes to lock in the juices.
Plate the chicken bites alongside the steamed broccoli and garnish with any remaining lemon zest if desired.