Preheat your oven to 400°F and line a baking sheet with parchment paper.
Toss the broccoli florets with half of the olive oil and a pinch of sea salt, then roast for 15 minutes until the edges are golden.
Bring a large pot of salted water to a boil and cook the whole wheat penne until al dente, then drain and set aside.
Season the chicken breast with sea salt, black pepper, and dried oregano on both sides.
Heat the remaining olive oil in a skillet over medium-high heat and sear the chicken for 5-7 minutes per side until cooked through.
Remove the chicken from the pan, let it rest for 5 minutes, then slice it into thin strips.
In the same skillet, add the minced garlic and sauté for 30 seconds until fragrant, then stir in the lemon juice.
Add the cooked pasta, roasted broccoli, and sliced chicken to the skillet, tossing everything together to coat in the lemon sauce.
Serve immediately topped with a sprinkle of parmesan cheese.