Preheat your oven to 400°F (200°C).
On a large baking sheet, toss the broccoli florets, sliced red bell pepper, and sliced zucchini with half of the olive oil, half of the sea salt, and the dried oregano.
Spread the vegetables in a single layer and roast for 18-20 minutes until tender and slightly charred at the edges.
While the vegetables roast, season the chicken breast on both sides with the remaining sea salt and black pepper.
Heat the remaining olive oil in a medium skillet over medium-high heat.
Place the chicken in the pan and sear for 5-7 minutes per side, or until the internal temperature reaches 165°F and the exterior is golden brown.
Add the minced garlic to the pan during the last 60 seconds of cooking, stirring constantly to avoid burning.
Remove the chicken from the pan and let it rest for 3 minutes before slicing.
Plate the chicken alongside the roasted vegetables and drizzle everything with fresh lemon juice before serving.