Preheat your oven to 400°F (200°C) and line two large rimmed baking sheets with parchment paper.
Peel the sweet potatoes and cut them into 1/2-inch cubes; slice the zucchini into half-moons and the bell peppers into 1-inch pieces.
Cut the chicken breasts into even 1-inch bite-sized pieces to ensure they cook at the same rate as the vegetables.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken, sweet potatoes, zucchini, peppers, and broccoli florets into a large mixing bowl and pour the lemon-herb dressing over the top, tossing thoroughly to coat.
Spread the mixture evenly across the prepared baking sheets, ensuring the pieces are in a single layer and not overcrowded.
Roast in the oven for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the sweet potatoes are tender.
Remove from the oven, garnish with freshly chopped parsley, and divide into five equal containers for your weekly meal prep.