Preheat your oven to 400 degrees Fahrenheit and line a large baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure they get crispy.
Dice the chicken breast into small, even cubes to ensure they cook at the same rate as the chickpeas.
In a large bowl, combine the chicken, chickpeas, olive oil, garlic powder, dried oregano, sea salt, and black pepper.
Toss everything together until the ingredients are evenly coated in the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the pieces.
Roast in the oven for 20 to 25 minutes, tossing halfway through, until the chicken is cooked through and the chickpeas are golden.
Place the fresh spinach in a bowl and top with the warm roasted chicken and chickpea mixture.