Preheat oven to 400°F and line a large baking sheet with parchment paper.
Cut chicken breast into 1-inch cubes and pat dry with a paper towel.
Rinse and drain chickpeas, then pat them thoroughly dry to ensure they get crispy.
Chop broccoli and bell pepper into bite-sized pieces.
In a large bowl, whisk together olive oil, lemon juice, garlic powder, smoked paprika, salt, and pepper.
Add chicken, chickpeas, and vegetables to the bowl and toss until evenly coated with the spice mixture.
Spread the mixture in a single layer on the baking sheet, ensuring nothing is overcrowded.
Roast for 20-25 minutes, tossing halfway through, until chicken is cooked through and chickpeas are golden.