Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken thighs dry with paper towels and place them on one side of the prepared baking sheet.
Slice the zucchini into rounds, chop the red bell pepper into bite-sized pieces, and cut the red onion into thick wedges.
Place the vegetables on the other side of the baking sheet and drizzle everything with the extra virgin olive oil.
Sprinkle the dried oregano, garlic powder, sea salt, and black pepper evenly over both the chicken and the vegetables.
Toss the vegetables and rub the chicken to ensure everything is well-coated with the oil and seasonings.
Spread the ingredients into a single layer, ensuring the chicken and vegetables are not overcrowded.
Roast in the center of the oven for 25-30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Remove from the oven and drizzle the fresh lemon juice over the chicken and vegetables to brighten the flavors before serving.