Preheat your oven to 400 degrees F and line a large rimmed baking sheet with parchment paper.
Rinse and drain the chickpeas thoroughly, then roll them between two clean kitchen towels to remove as much moisture as possible for maximum crunch.
Dice the chicken breast into small cubes, roughly a half-inch in size, to ensure they roast at the same rate as the chickpeas.
In a large mixing bowl, toss the chicken and dried chickpeas with the olive oil, garlic powder, oregano, sea salt, and black pepper until evenly coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between the pieces so they roast rather than steam.
Bake for 22 to 25 minutes, tossing the pan halfway through, until the chicken is cooked through and the chickpeas are golden and firm.
Remove from the oven and immediately drizzle with lemon juice and garnish with finely chopped fresh parsley before serving warm.