Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Chop the chicken breast into uniform 1-inch cubes and place them in a large mixing bowl.
Prepare the vegetables by cutting the broccoli into bite-sized florets, slicing the bell pepper into strips, and dicing the zucchini into half-moons.
Add the prepared vegetables to the bowl with the chicken cubes.
Drizzle the olive oil over the chicken and vegetables, then sprinkle with turmeric, garlic powder, sea salt, and black pepper.
Toss the mixture thoroughly with your hands or a large spoon until every piece is evenly coated in oil and spices.
Spread the mixture in a single layer on the baking sheet, ensuring the pieces are not overcrowded to allow for even crisping.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and drizzle the fresh lemon juice over the tray before serving warm.