Preheat your oven to 400°F and line a large baking sheet with parchment paper.
In a small saucepan, combine the dry millet and water. Bring to a boil, then reduce heat to low, cover, and simmer for 15-18 minutes until the water is absorbed and the grain is fluffy.
While the millet cooks, cut the chicken breast into bite-sized pieces and mince the garlic.
Place the chicken pieces and broccoli florets on the prepared baking sheet. Drizzle with olive oil and sprinkle with sea salt, black pepper, and minced garlic.
Toss the chicken and broccoli until evenly coated, then spread them out in a single layer.
Roast in the oven for 18-20 minutes, or until the chicken is cooked through and the broccoli edges are golden and crispy.
Once the millet is finished, fluff it with a fork and stir in the lemon zest, lemon juice, and nutritional yeast.
Serve the roasted chicken and crispy broccoli over the bed of seasoned golden millet.