Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Slice the chicken breast into 1-inch uniform cubes to ensure even cooking.
Chop the zucchini into half-moons and the red bell pepper into bite-sized squares.
In a large mixing bowl, combine the chicken, zucchini, and bell peppers with the olive oil.
Add the chili flakes, smoked paprika, garlic powder, onion powder, sea salt, and black pepper to the bowl.
Toss the ingredients thoroughly until the chicken and vegetables are completely coated in the spice mixture.
Spread the mixture in a single layer on the prepared baking sheet, ensuring no pieces are overlapping.
Roast for 18 to 20 minutes until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and serve immediately on a large plate.