Preheat your oven to 400°F (200°C) and line a baking sheet with aluminum foil or parchment paper.
In a mixing bowl, whisk together the olive oil, garlic powder, onion powder, smoked paprika, salt, and pepper.
Place the chicken breasts in the bowl and coat them well with the seasoning mixture.
Arrange the seasoned chicken breasts on the baking sheet and bake for 20-25 minutes until cooked through, reaching an internal temperature of 165°F (75°C).
While the chicken is baking, rinse the quinoa under cold water. In a medium saucepan, bring the chicken broth (or water) to a boil, add the quinoa, reduce the heat to low, cover, and simmer for about 15 minutes or until the liquid is absorbed.
In the last 10 minutes of the chicken cooking, add the broccoli florets and sliced bell peppers to the baking sheet. Roast until they are tender and slightly charred.
Once the chicken is done, remove it from the oven and let it rest for a few minutes. Then, slice the chicken into strips.
In food storage containers, distribute the quinoa evenly among them, followed by the roasted vegetables, and top with sliced chicken.
Squeeze fresh lemon juice over each portion for added flavor, then seal the containers and refrigerate.