Preheat your oven to 400°F (200°C).
Prepare a baking dish with a drizzle of olive oil.
Season the chicken breasts with salt, pepper, and oregano.
Place the chicken in the baking dish.
Arrange broccoli, cherry tomatoes, bell pepper, and onion around the chicken.
Drizzle remaining olive oil over the vegetables.
Add minced garlic on top.
Bake for 25 minutes or until the chicken is cooked through.
Let it rest for 5 minutes before slicing.
Garnish with fresh herbs if desired.