– 1 pound boneless, skinless chicken thighs – 1 tablespoon olive oil – 1 teaspoon garlic powder – 1 teaspoon cumin – 1 teaspoon onion powder – ½ teaspoon smoked paprika – ½ teaspoon brown sugar – ¼ teaspoon chili powder – ¼ teaspoon salt – ¼ teaspoon black pepper – 1 red bell pepper – 1 green bell pepper – 1 yellow bell pepper – ½ medium red onion – 2 tablespoons olive oil