Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Chop the broccoli, red bell pepper, and zucchini into bite-sized pieces and place them in a bowl.
Toss the vegetables with 0.5 tablespoons of olive oil and a pinch of sea salt until evenly coated.
Spread the vegetables in a single layer on the baking sheet and roast for 18-20 minutes until tender and slightly charred.
While vegetables roast, season the chicken breast on both sides with sea salt, black pepper, and dried oregano.
Heat the remaining 0.5 tablespoons of olive oil in a stainless steel or cast-iron skillet over medium-high heat.
Place the chicken in the hot skillet and sear for 6-7 minutes per side, or until the internal temperature reaches 165°F.
During the final minute of cooking the chicken, add the minced garlic to the pan and sauté until fragrant.
Remove the chicken from the pan and let it rest for 3 minutes to keep the juices intact.
Plate the chicken alongside the roasted vegetables and drizzle everything with fresh lemon juice before serving.