Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Chop the broccoli, red bell pepper, and zucchini into bite-sized pieces and place them in a large mixing bowl.
Drizzle 0.5 tbsp of olive oil over the vegetables and sprinkle with half of the sea salt, black pepper, garlic powder, and dried oregano.
Spread the vegetables in a single layer on the baking sheet and roast for 18 to 20 minutes until they are tender and slightly charred.
While the vegetables roast, season the chicken breast on both sides with the remaining sea salt, black pepper, garlic powder, and dried oregano.
Heat the remaining 1 tbsp of olive oil in a heavy-bottomed skillet or cast-iron pan over medium-high heat.
Place the chicken in the hot pan and sear for 6 to 8 minutes per side until the exterior is golden brown and the internal temperature reaches 165°F.
Remove the chicken from the pan and let it rest for 3 minutes before slicing and serving with the roasted vegetables.