Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and halve the baby gold potatoes.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic clove, dried oregano, sea salt, and black pepper.
Add the chicken, potatoes, broccoli florets, sliced red bell pepper, and diced red onion to the bowl and toss until everything is thoroughly coated in the marinade.
Spread the mixture in a single, even layer onto the prepared sheet pan, ensuring the ingredients are not overcrowded so they roast properly.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the potatoes are fork-tender and slightly golden.
Remove from the oven and serve immediately, perhaps with an extra squeeze of fresh lemon if desired.