Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Drain and rinse the chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure maximum crispiness.
Cut the chicken breast into uniform 1-inch cubes for even cooking.
In a medium mixing bowl, combine the chicken cubes, dried chickpeas, olive oil, oregano, garlic powder, sea salt, and black pepper.
Toss the mixture until everything is evenly coated in the oil and spices.
Spread the chicken and chickpeas in a single layer on the prepared baking sheet, ensuring they are not overcrowded.
Roast for 20 to 25 minutes, shaking the pan halfway through, until the chicken is cooked through and the chickpeas are golden brown.
Remove from the oven and immediately toss the hot mixture with fresh lemon juice and lemon zest.
Arrange the fresh baby arugula in a bowl and top with the warm roasted lemon-herb mixture.