Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a small saucepan, combine the dry millet with 0.5 cup of water and a pinch of salt. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes until the water is absorbed and the millet is fluffy.
While the millet cooks, place the chicken breast, sliced bell peppers, and zucchini on the prepared baking sheet.
Drizzle the chicken and vegetables with olive oil and season evenly with sea salt, black pepper, dried oregano, and garlic powder.
Roast in the oven for 18 to 20 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into thin strips.
Assemble the bowl by portioning the cooked millet into a dish, then top with the roasted vegetables and sliced chicken.
Finish the dish by drizzling fresh lemon juice over the top for a bright, clean flavor.