Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Chop the broccoli, red bell pepper, and zucchini into uniform, bite-sized pieces.
Place the vegetables on the baking sheet and toss with half of the olive oil, a pinch of sea salt, and a pinch of black pepper.
Roast the vegetables in the oven for 15-20 minutes until they are tender and slightly charred on the edges.
While the vegetables roast, season the chicken breast evenly with garlic powder, dried oregano, and the remaining salt and pepper.
Heat the remaining olive oil in a large skillet over medium-high heat.
Add the chicken breast to the skillet and cook for 6-7 minutes per side, or until the internal temperature reaches 165°F.
Remove the chicken from the heat and let it rest for 3 minutes before slicing it into thin strips.
Assemble the bowl by placing the roasted vegetables at the base and topping them with the sliced chicken.
Finish the dish by adding the sliced avocado and drizzling fresh lemon juice over the top.